* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download G5A01 What is impedance?
Operational amplifier wikipedia , lookup
Audio power wikipedia , lookup
Nanofluidic circuitry wikipedia , lookup
Opto-isolator wikipedia , lookup
Spark-gap transmitter wikipedia , lookup
Mechanical filter wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Power MOSFET wikipedia , lookup
Power electronics wikipedia , lookup
Surge protector wikipedia , lookup
Radio transmitter design wikipedia , lookup
Electronic engineering wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Valve audio amplifier technical specification wikipedia , lookup
Zobel network wikipedia , lookup
Index of electronics articles wikipedia , lookup
Electrical engineering wikipedia , lookup
Standing wave ratio wikipedia , lookup
Switched-mode power supply wikipedia , lookup
G5 - ELECTRICAL PRINCIPLES [3 exam questions - 3 groups] G5A Resistance; reactance; inductance; capacitance; impedance; impedance matching G5B The Decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations G5C Resistors, capacitors, and inductors in series and parallel; transformers 1 Electrical Principles G5A Resistance; Reactance • Reactance • • • Is the opposition to the flow of alternating current cause by capacitance or inductance Causes opposition to the flow of alternating current in an inductor Causes opposition to the flow of alternating current in a capacitor 2 Electrical Principles G5A Inductance • A coil reacts to AC such that as the frequency of the applied AC increases, the reactance increases (directly proportional) • • X L= 2∏FL Inductance Reactance = 2*PI*Frequency*Inductance 3 Electrical Principles G5A Capacitance • A capacitor reacts to AC such that as the frequency of the applied AC increases, the reactance decreases (inversely proportional) • • 1 XC= 2 *∏*F*C XC = 1 divided by (2*PI*Frequency*Capacitance) 4 Electrical Principles G5A Impedance • Impedance is the opposition to the flow of current in an AC circuit • When the impedance of an electrical load is equal to the internal impedance of the power source the source can deliver maximum power to the load • The Ohm is the unit used to measure impedance 5 Electrical Principles G5A Impedance matching • Impedance matching is important – • • • So the source can deliver maximum power to the load One reason to use an impedance matching transformer is to maximize the transfer of power Core saturation of a conventional impedance matching transformer should be avoided because harmonics and distortion could result 6 Electrical Principles G5A Impedance matching cont’d • All the following devices can be used for impedance matching at radio frequencies: • • • • A transformer A Pi-network A length of transmission line One method of impedance matching between two AC circuits is to insert an LC network between the two circuits 7 Electrical Principles G5A01 What is impedance? A. B. C. D. The The The The electric charge stored by a capacitor inverse of resistance opposition to the flow of current in an AC circuit force of repulsion between two similar electric fields 8 Electrical Principles G5A01 What is impedance? A. The electric charge stored by a capacitor B. The inverse of resistance C. The opposition to the flow of current in an AC circuit D. The force of repulsion between two similar electric fields 9 Electrical Principles Resonant Circuit 10 Electrical Principles G5A02 What is reactance? A. Opposition to the flow of direct current caused by resistance B. Opposition to the flow of alternating current caused by capacitance or inductance C. A property of ideal resistors in AC circuits D. A large spark produced at switch contacts when an inductor is deenergized 11 Electrical Principles G5A02 What is reactance? A. Opposition to the flow of direct current caused by resistance B. Opposition to the flow of alternating current caused by capacitance or inductance C. A property of ideal resistors in AC circuits D. A large spark produced at switch contacts when an inductor is deenergized 12 Electrical Principles G5A03 Which of the following causes opposition to the flow of alternating current in an inductor? A. B. C. D. Conductance Reluctance Admittance Reactance 13 Electrical Principles G5A03 Which of the following causes opposition to the flow of alternating current in an inductor? A. Conductance B. Reluctance C. Admittance D. Reactance 14 Electrical Principles G5A04 Which of the following causes opposition to the flow of alternating current in a capacitor? A. B. C. D. Conductance Reluctance Reactance Admittance 15 Electrical Principles G5A04 Which of the following causes opposition to the flow of alternating current in a capacitor? A. Conductance B. Reluctance C. Reactance D. Admittance 16 Electrical Principles G5A05 How does a coil react to AC? A. As the frequency of the applied AC increases, the reactance decreases B. As the amplitude of the applied AC increases, the reactance increases C. As the amplitude of the applied AC increases, the reactance decreases D. As the frequency of the applied AC increases, the reactance increases 17 Electrical Principles G5A05 How does a coil react to AC? A. As the frequency of the applied AC increases, the reactance decreases B. As the amplitude of the applied AC increases, the reactance increases C. As the amplitude of the applied AC increases, the reactance decreases D. As the frequency of the applied AC increases, the reactance increases 18 Electrical Principles G5A06 How does a capacitor react to AC? A. As the frequency of the applied AC increases, the reactance decreases B. As the frequency of the applied AC increases, the reactance increases C. As the amplitude of the applied AC increases, the reactance increases D. As the amplitude of the applied AC increases, the reactance decreases 19 Electrical Principles G5A06 How does a capacitor react to AC? A. As the frequency of the applied AC increases, the reactance decreases B. As the frequency of the applied AC increases, the reactance increases C. As the amplitude of the applied AC increases, the reactance increases D. As the amplitude of the applied AC increases, the reactance decreases 20 Electrical Principles G5A07 What happens when the impedance of an electrical load is equal to the internal impedance of the power source? A. B. C. D. The source delivers minimum power to the load The electrical load is shorted No current can flow through the circuit The source can deliver maximum power to the load 21 Electrical Principles G5A07 What happens when the impedance of an electrical load is equal to the internal impedance of the power source? A. The source delivers minimum power to the load B. The electrical load is shorted C. No current can flow through the circuit D. The source can deliver maximum power to the load 22 Electrical Principles G5A08 Why is impedance matching important? A. So the source can deliver maximum power to the load B. So the load will draw minimum power from the source C. To ensure that there is less resistance than reactance in the circuit D. To ensure that the resistance and reactance in the circuit are equal 23 Electrical Principles G5A08 Why is impedance matching important? A. So the source can deliver maximum power to the load B. So the load will draw minimum power from the source C. To ensure that there is less resistance than reactance in the circuit D. To ensure that the resistance and reactance in the circuit are equal 24 Electrical Principles G5A09 What unit is used to measure reactance? A. B. C. D. Farad Ohm Ampere Siemens 25 Electrical Principles G5A09 What unit is used to measure reactance? A. Farad B. Ohm C. Ampere D. Siemens 26 Electrical Principles G5A10 What unit is used to measure impedance? A. B. C. D. Volt Ohm Ampere Watt 27 Electrical Principles G5A10 What unit is used to measure impedance? A. Volt B. Ohm C. Ampere D. Watt 28 Electrical Principles G5A11 Why should core saturation of a conventional impedance matching transformer be avoided? A. B. C. D. Harmonics and distortion could result Magnetic flux would increase with frequency RF susceptance would increase Temporary changes of the core permeability could result 29 Electrical Principles G5A11 Why should core saturation of a conventional impedance matching transformer be avoided? A. Harmonics and distortion could result B. Magnetic flux would increase with frequency C. RF susceptance would increase D. Temporary changes of the core permeability could result 30 Electrical Principles G5A12 What is one reason to use an impedance matching transformer? A. B. C. D. To To To To reduce power dissipation in the transmitter maximize the transfer of power minimize SWR at the antenna minimize SWR in the transmission line 31 Electrical Principles G5A12 What is one reason to use an impedance matching transformer? A. To reduce power dissipation in the transmitter B. To maximize the transfer of power C. To minimize SWR at the antenna D. To minimize SWR in the transmission line 32 Electrical Principles G5A13 Which of the following devices can be used for impedance matching at radio frequencies? A. B. C. D. A transformer A Pi-network A length of transmission line All of these choices are correct 33 Electrical Principles G5A13 Which of the following devices can be used for impedance matching at radio frequencies? A. A transformer B. A Pi-network C. A length of transmission line D. All of these choices are correct 34 Electrical Principles G5A14 Which of the following describes one method of impedance matching between two AC circuits? A. B. C. D. Insert an LC network between the two circuits Reduce the power output of the first circuit Increase the power output of the first circuit Insert a circulator between the two circuits 35 Electrical Principles G5A14 Which of the following describes one method of impedance matching between two AC circuits? A. Insert an LC network between the two circuits B. Reduce the power output of the first circuit C. Increase the power output of the first circuit D. Insert a circulator between the two circuits 36 Electrical Principles G5B The Decibel • • • A two-times increase or decrease in power results in a change of 3 dB A percentage of 20.5 per cent power loss would result from a transmission line lose of 1 dB CURRENT AND VOLTAGE DIVIDERS • The total current equals the sum of the currents through each branch of a parallel circuit 37 Electrical Principles G5B Electrical power calculations • There are 200 watts of electrical power used if 400 VDC is supplied to an 800-ohm circuit • • • • • P P P P = = = = E2/R 4002/800 1600/800 200 watts There are 2.4 watts of electrical power used by a 12-VDC light bulb that draws 0.2 amperes • • • P=I*E P = 0.2 * 12 P = 2.4 watts 38 Electrical Principles G5B Electrical power calculations cont’d • Approximately 61 milliwatts are being dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms • • • • P = I2 R P = .0072 * 1250 P = 61 mW or 0.061 watts The voltage across a 50-ohm dummy load dissipating 1200 watts would be 245 volts • • • • P E E E = = = = I * E and E = I * R therefore E = SQRT ( P * R) √(1200*50) √60000 245 volts 39 Electrical Principles G5B Sine wave root-mean-square (RMS) values • The RMS value measurement of an AC signal is equivalent to a DC voltage of the same value • • • Most ac voltages are specified by their effective voltage The phrase root-mean-square describes the actual process of calculating the effective voltage The RMS voltage of a sine wave with a value of 17 volts peak is 12 volts RMS • • 0.707071* volt peak = volts RMS VRMS = 0.707071 * 17 = 12 volts RMS 40 Electrical Principles G5B PEP calculations • The peak-to-peak (PEP) output power from a transmitter is 100 watts if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitted output • • • • • • • (Peak envelope voltage x 0.707)2 PEP = R Peak-to-peak envelope voltage Peak envelope voltage = 2 (100x 0.707)2 PEP = 50 = 100W 41 Electrical Principles G5B PEP calculations cont’d • The peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts is 339.4 volts • • • If you know the RMS voltage and want to know the peak value , multiply the RMS by the square root of 2 (which is 1.414). If you want to know peak-to-peak, double the result 120 x 1.414 x 2 = 339.4 V The ratio of peak envelope power to average power for an unmodulated carrier is 1.00 42 Electrical Principles G5B PEP calculations cont’d • The output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm resistor connected to the transmitter output is 625 watts • • • • • • • • Use the formulas ERMS2 (1) PEP = R , (2) EPEAK = EPK-PK/ 2, (3) ERMS = 0.707 x E PEAK EPEAK = 500/2 = 250 ERMS = 0.707 x 250 = 176.75 PEP = (176.75)2 = 31222/50 =625 watts R 43 Electrical Principles G 5B PEP calculations cont’d * If an average reading wattmeter connected to the transmitter output indicates 1060 watts the output PEP of an unmodulated carrier is 1060 watts 44 Electrical Principles G5B01 A two-times increase or decrease in power results in a change of how many dB? A. B. C. D. 2 dB 3 dB 6 dB 12 dB 45 Electrical Principles G5B01 A two-times increase or decrease in power results in a change of how many dB? A. 2 dB B. 3 dB C. 6 dB D. 12 dB 46 Electrical Principles G5B02 How does the total current relate to the individual currents in each branch of a parallel circuit? A. It equals the average of each branch current B. It decreases as more parallel branches are added to the circuit C. It equals the sum of the currents through each branch D. It is the sum of the reciprocal of each individual voltage drop 47 Electrical Principles G5B02 How does the total current relate to the individual currents in each branch of a parallel circuit? A. It equals the average of each branch current B. It decreases as more parallel branches are added to the circuit C. It equals the sum of the currents through each branch D. It is the sum of the reciprocal of each individual voltage drop 48 Electrical Principles Ohm’s Law and Power Calculations E I P R I E E=Voltage (Volts) I=Current (Amps) R=Resistance (Ohms) P=Power (Watts) 49 Electrical Principles G5B03 How many watts of electrical power are used if 400 VDC is supplied to an 800ohm load? A. B. C. D. 0.5 watts 200 watts 400 watts 3200 watts 50 Electrical Principles G5B03 How many watts of electrical power are used if 400 VDC is supplied to an 800ohm load? A. 0.5 watts B. 200 watts C. 400 watts D. 3200 watts 51 Electrical Principles G5B04 How many watts of electrical power are used by a 12-VDC light bulb that draws 0.2 amperes? A. B. C. D. 2.4 watts 24 watts 6 watts 60 watts 52 Electrical Principles G5B04 How many watts of electrical power are used by a 12-VDC light bulb that draws 0.2 amperes? A. 2.4 watts B. 24 watts C. 6 watts D. 60 watts 53 Electrical Principles G5B05 How many watts are being dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms? A. B. C. D. Approximately 61 milliwatts Approximately 39 milliwatts Approximately 11 milliwatts Approximately 9 milliwatts 54 Electrical Principles G5B05 How many watts are being dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms? A. Approximately 61 milliwatts B. Approximately 39 milliwatts C. Approximately 11 milliwatts D. Approximately 9 milliwatts 55 Electrical Principles G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output? A. B. C. D. 1.4 watts 100 watts 353.5 watts 400 watts 56 Electrical Principles G5B06 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output? A. 1.4 watts B. 100 watts C. 353.5 watts D. 400 watts 57 Electrical Principles RMS, Peak and Peak to Peak Voltages 58 Electrical Principles G5B07 Which measurement of an AC signal is equivalent to a DC voltage of the same value? A. B. C. D. The The The The peak-to-peak value peak value RMS value reciprocal of the RMS value 59 Electrical Principles G5B07 Which measurement of an AC signal is equivalent to a DC voltage of the same value? A. The peak-to-peak value B. The peak value C. The RMS value D. The reciprocal of the RMS value 60 Electrical Principles G5B08 What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts? A. B. C. D. 84.8 volts 169.7 volts 240.0 volts 339.4 volts 61 Electrical Principles G5B08 What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts? A. 84.8 volts B. 169.7 volts C. 240.0 volts D. 339.4 volts 62 Electrical Principles G5B09 What is the RMS voltage of sine wave with a value of 17 volts peak? A. B. C. D. 8.5 volts 12 volts 24 volts 34 volts 63 Electrical Principles G5B09 What is the RMS voltage of sine wave with a value of 17 volts peak? A. 8.5 volts B. 12 volts C. 24 volts D. 34 volts 64 Electrical Principles G5B11 What is the ratio of peak envelope power to average power for an unmodulated carrier? A. B. C. D. .707 1.00 1.414 2.00 65 Electrical Principles G5B11 What is the ratio of peak envelope power to average power for an unmodulated carrier? A. .707 B. 1.00 C. 1.414 D. 2.00 66 Electrical Principles G5B12 What would be the voltage across a 50-ohm dummy load dissipating 1200 watts? A. B. C. D. 173 245 346 692 volts volts volts volts 67 Electrical Principles G5B12 What would be the voltage across a 50-ohm dummy load dissipating 1200 watts? A. 173 volts B. 245 volts C. 346 volts D. 692 volts 68 Electrical Principles G5B13 What percentage of power loss would result from a transmission line loss of 1 dB? A. B. C. D. 10.9 12.2 20.5 25.9 % % % % 69 Electrical Principles G5B13 What percentage of power loss would result from a transmission line loss of 1 dB? A. 10.9 % B. 12.2 % C. 20.5 % D. 25.9 % 70 Electrical Principles G5B14 What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm resistor connected to the transmitter output? A. B. C. D. 8.75 watts 625 watts 2500 watts 5000 watts 71 Electrical Principles G5B14 What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm resistor connected to the transmitter output? A. 8.75 watts B. 625 watts C. 2500 watts D. 5000 watts 72 Electrical Principles G5B15 What is the output PEP of an unmodulated carrier if an average reading wattmeter connected to the transmitter output indicates 1060 watts? A. B. C. D. 530 watts 1060 watts 1500 watts 2120 watts 73 Electrical Principles G5B15 What is the output PEP of an unmodulated carrier if an average reading wattmeter connected to the transmitter output indicates 1060 watts? A. 530 watts B. 1060 watts C. 1500 watts D. 2120 watts 74 Electrical Principles G5C Resistors, Inductors & Capacitors • Total value of resistors, capacitors and inductors connected in series and in parallel • • • • Resistors ( R) and inductors (I) act the same way • Resistors in series add up: Rtotal = R1 + R2 + R3 • Inductors in series add up: Ltotal = L1 + L2 + L3 Resistors and Inductors in Parallel combine with a resulting total value that is always LESS than the value of the lowest value resistor in parallel Capacitors in Parallel simply add up • C total = C1 + C2 + C3 Capacitors in SERIES combine with a resulting total value that is always less than the value of the lowest value capacitor in series 75 Electrical Principles G5C Transformers • Mutual inductance causes a voltage to appear across the secondary winding of a transformer when an ACC voltage is connected across its primary winding • The source of energy is normally connected across the primary winding • The current in the primary winding of a transformer if no load is attached to the secondary winding is called the magnetizing current 76 Electrical Principles G5C Transformers cont’d • Turns ration problem • • • • • • • The voltage of the secondary is equal to the voltage of the primary times the number turns of the secondary divided by the number of turns of the primary NS EP x NS ES = EP x NP = NP (**hint secondary/ primary) The voltage across a 500-turn secondary winding in a transformer is 26.7 volts if the 2250- turn primary is connected to 120 VAC EP = 120 VAC NP = 2250 (** Hint 500/2500 = 1/5 of the primary) NS = 500 ~ 25 volts 77 Electrical Principles G5C Transformers cont’d • • • • The ration of turns of the primary, NP, to the turns on the secondary, NS, is equal to the square root of the ration of the primary impedance, ZP, to the secondary impedance, Zs 12.2 to 1 is the turns ration of a transformer used to match an audio amplifier having a 600-ohm output impedance to a speaker having a 4-ohm impedance NP √ZP NS = √ZS √600/4 = √150 = 12.25 to 1 78 Electrical Principles G5C01 What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding? A. B. C. D. Capacitive coupling Displacement current coupling Mutual inductance Mutual capacitance 79 Electrical Principles G5C01 What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding? A. Capacitive coupling B. Displacement current coupling C. Mutual inductance D. Mutual capacitance 80 Electrical Principles G5C02 Where is the source of energy normally connected in a transformer? A. B. C. D. To To To To the the the the secondary winding primary winding core plates 81 Electrical Principles G5C02 Where is the source of energy normally connected in a transformer? A. To the secondary winding B. To the primary winding C. To the core D. To the plates 82 Electrical Principles G5C03 What is current in the primary winding of a transformer called if no load is attached to the secondary? A. B. C. D. Magnetizing current Direct current Excitation current Stabilizing current 83 Electrical Principles G5C03 What is current in the primary winding of a transformer called if no load is attached to the secondary? A. Magnetizing current B. Direct current C. Excitation current D. Stabilizing current 84 Electrical Principles G5C04 What is the total resistance of three 100-ohm resistors in parallel? A. B. C. D. .30 ohms .33 ohms 33.3 ohms 300 ohms 85 Electrical Principles G5C04 What is the total resistance of three 100-ohm resistors in parallel? A. .30 ohms B. .33 ohms C. 33.3 ohms D. 300 ohms 86 Electrical Principles G5C05 What is the value of each resistor if three equal value resistors in parallel produce 50 ohms of resistance, and the same three resistors in series produce 450 ohms? A. B. C. D. 1500 ohms 90 ohms 150 ohms 175 ohms 87 Electrical Principles G5C05 What is the value of each resistor if three equal value resistors in parallel produce 50 ohms of resistance, and the same three resistors in series produce 450 ohms? A. 1500 ohms B. 90 ohms C. 150 ohms D. 175 ohms 88 Electrical Principles G5C06 What is the voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC? A. B. C. D. 2370 volts 540 volts 26.7 volts 5.9 volts 89 Electrical Principles G5C06 What is the voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC? A. 2370 volts B. 540 volts C. 26.7 volts D. 5.9 volts 90 Electrical Principles G5C07 What is the turns ratio of a transformer used to match an audio amplifier having a 600-ohm output impedance to a speaker having a 4-ohm impedance? A. B. C. D. 12.2 to 1 24.4 to 1 150 to 1 300 to 1 91 Electrical Principles G5C07 What is the turns ratio of a transformer used to match an audio amplifier having a 600-ohm output impedance to a speaker having a 4-ohm impedance? A. 12.2 to 1 B. 24.4 to 1 C. 150 to 1 D. 300 to 1 92 Electrical Principles G5C08 What is the equivalent capacitance of two 5000 picofarad capacitors and one 750 picofarad capacitor connected in parallel? A. B. C. D. 576.9 picofarads 1733 picofarads 3583 picofarads 10750 picofarads 93 Electrical Principles G5C08 What is the equivalent capacitance of two 5000 picofarad capacitors and one 750 picofarad capacitor connected in parallel? A. 576.9 picofarads B. 1733 picofarads C. 3583 picofarads D. 10750 picofarads 94 Electrical Principles G5C09 What is the capacitance of three 100 microfarad capacitors connected in series? A. B. C. D. .30 microfarads .33 microfarads 33.3 microfarads 300 microfarads 95 Electrical Principles G5C09 What is the capacitance of three 100 microfarad capacitors connected in series? A. .30 microfarads B. .33 microfarads C. 33.3 microfarads D. 300 microfarads 96 Electrical Principles G5C10 What is the inductance of three 10 millihenry inductors connected in parallel? A. B. C. D. .30 Henrys 3.3 Henrys 3.3 millihenrys 30 millihenrys 97 Electrical Principles G5C10 What is the inductance of three 10 millihenry inductors connected in parallel? A. .30 Henrys B. 3.3 Henrys C. 3.3 millihenrys D. 30 millihenrys 98 Electrical Principles G5C11 What is the inductance of a 20 millihenry inductor in series with a 50 millihenry inductor? A. B. C. D. .07 millihenrys 14.3 millihenrys 70 millihenrys 1000 millihenrys 99 Electrical Principles G5C11 What is the inductance of a 20 millihenry inductor in series with a 50 millihenry inductor? A. .07 millihenrys B. 14.3 millihenrys C. 70 millihenrys D. 1000 millihenrys 100 Electrical Principles G5C12 What is the capacitance of a 20 microfarad capacitor in series with a 50 microfarad capacitor? A. B. C. D. .07 microfarads 14.3 microfarads 70 microfarads 1000 microfarads 101 Electrical Principles G5C12 What is the capacitance of a 20 microfarad capacitor in series with a 50 microfarad capacitor? A. .07 microfarads B. 14.3 microfarads C. 70 microfarads D. 1000 microfarads 102 Electrical Principles G5C13 What component should be added to a capacitor in a circuit to increase the circuit capacitance? A. B. C. D. An inductor in series A resistor in series A capacitor in parallel A capacitor in series 103 Electrical Principles G5C13 What component should be added to a capacitor in a circuit to increase the circuit capacitance? A. An inductor in series B. A resistor in series C. A capacitor in parallel D. A capacitor in series 104 Electrical Principles G5C14 What component should be added to an inductor in a circuit to increase the circuit inductance? A. B. C. D. A capacitor in series A resistor in parallel An inductor in parallel An inductor in series 105 Electrical Principles G5C14 What component should be added to an inductor in a circuit to increase the circuit inductance? A. A capacitor in series B. A resistor in parallel C. An inductor in parallel D. An inductor in series 106 Electrical Principles G5C15 What is the total resistance of a 10 ohm, a 20 ohm, and a 50 ohm resistor in parallel? A. B. C. D. 5.9 ohms 0.17 ohms 10000 ohms 80 ohms 107 Electrical Principles G5C15 What is the total resistance of a 10 ohm, a 20 ohm, and a 50 ohm resistor in parallel? A. 5.9 ohms B. 0.17 ohms C. 10000 ohms D. 80 ohms 108 Electrical Principles G5C16 What component should be added to an existing resistor in a circuit to increase circuit resistance? A. B. C. D. A A A A resistor in parallel resistor in series capacitor in series capacitor in parallel 109 Electrical Principles G5C16 What component should be added to an existing resistor in a circuit to increase circuit resistance? A. A resistor in parallel B. A resistor in series C. A capacitor in series D. A capacitor in parallel 110 Electrical Principles G5 - ELECTRICAL PRINCIPLES [3 exam questions - 3 groups] 111 Electrical Principles