2000 (Old) Higher physics SQA solutions
... through the resistor and relay coil. The discharge current magnetises the coil closing the switch in the lamp circuit, causing the lamp to light. As the discharge current gradually falls the coil loses its magnetism and the switch in the lamp circuit opens. When this happens the lamp goes off. (B) D ...
... through the resistor and relay coil. The discharge current magnetises the coil closing the switch in the lamp circuit, causing the lamp to light. As the discharge current gradually falls the coil loses its magnetism and the switch in the lamp circuit opens. When this happens the lamp goes off. (B) D ...
Electrical Resistance - U
... You have two lamps in your living room that are supplied power through a parallel connection. The power supply produces 120 volts. One lamp has a resistance of 90 ohms, and the other a resistance of 70 ohms. Calculate: ...
... You have two lamps in your living room that are supplied power through a parallel connection. The power supply produces 120 volts. One lamp has a resistance of 90 ohms, and the other a resistance of 70 ohms. Calculate: ...
Lecture 14
... Voltage, Current, Ohm’s law Voltage is analogous to pressure, and is measured naturally enough, in volts. Current is analogous to flow, and is measure in amperes or amps for short. Direct current (DC) is a constant voltage, e.g. a single C or D battery produces 1.5 volts. Alternating Curren ...
... Voltage, Current, Ohm’s law Voltage is analogous to pressure, and is measured naturally enough, in volts. Current is analogous to flow, and is measure in amperes or amps for short. Direct current (DC) is a constant voltage, e.g. a single C or D battery produces 1.5 volts. Alternating Curren ...
01-02MurraysOhmsLaw
... Example 2: If there is a 220 resistor in the circuit above, what is the current? R = V/I, I = V/R = (12.0 V)/(220 ) = .05454 = .055 A or 55 mA ...
... Example 2: If there is a 220 resistor in the circuit above, what is the current? R = V/I, I = V/R = (12.0 V)/(220 ) = .05454 = .055 A or 55 mA ...
Power Point
... Producing Current • Current: Flow of charged particles • Cell: Source of conversion of chemicals into electric energy. Types of Cells: Voltaic - Common everyday ‘battery’. ...
... Producing Current • Current: Flow of charged particles • Cell: Source of conversion of chemicals into electric energy. Types of Cells: Voltaic - Common everyday ‘battery’. ...
Low Pressure Gas Discharge Lamps
... for operation are relatively simple. A power supply and a series resistor power the lamp. Lamp operation occurs as the breakdown threshold of the fill gas is exceeded, usually on the order of -1100 to -1299 volts DC. The series resistor limits the current of the lamp to a reasonable operating level. ...
... for operation are relatively simple. A power supply and a series resistor power the lamp. Lamp operation occurs as the breakdown threshold of the fill gas is exceeded, usually on the order of -1100 to -1299 volts DC. The series resistor limits the current of the lamp to a reasonable operating level. ...
M21-1000 Training System CONTENTS
... The low values are expressed in mH (millihenry) and in uH (microhenry). Also in this case, there are fixed inductors and variable inductors. The inductors, which show a constant nominal inductance at their terminals, are called fixed inductors. ...
... The low values are expressed in mH (millihenry) and in uH (microhenry). Also in this case, there are fixed inductors and variable inductors. The inductors, which show a constant nominal inductance at their terminals, are called fixed inductors. ...
Fridge Door Alarm
... fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the dark, the photo resistor R2 has a high resistance (>200K) thus clamping IC1 by holding pin 12 high. When a beam of light enters from the opening, or the fridge lamp lights, the photo resistor lowe ...
... fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the dark, the photo resistor R2 has a high resistance (>200K) thus clamping IC1 by holding pin 12 high. When a beam of light enters from the opening, or the fridge lamp lights, the photo resistor lowe ...
Ohm`s Law
... A short circuit has zero resistance and, therefore, no voltage is needed to allow current to flow through it. An open circuit has infinite resistance and, therefore, no current flows across an open circuit no matter how large a voltage applied across the open circuit. ...
... A short circuit has zero resistance and, therefore, no voltage is needed to allow current to flow through it. An open circuit has infinite resistance and, therefore, no current flows across an open circuit no matter how large a voltage applied across the open circuit. ...
Self Study Unit 1.2
... The most basic equation for Ohm’s Law is: E = I ×R In other words, when you know the current going into a circuit and the resistance of the circuit, the formula used to calculate voltage across the circuit is voltage (E) equals current (I) multiplied by resistance (R). (T5D02) When you know the volt ...
... The most basic equation for Ohm’s Law is: E = I ×R In other words, when you know the current going into a circuit and the resistance of the circuit, the formula used to calculate voltage across the circuit is voltage (E) equals current (I) multiplied by resistance (R). (T5D02) When you know the volt ...
Exam2_review
... Answer: Box your answer. Does this answer make sense (order of magnitude?), have UNITS!!!!? , include all parts (vector or directions, etc.)? This step is to make sure your answer is complete and reasonable. Here are a few problems like the ones that you may see on the exam. 1. Suppose you have a DC ...
... Answer: Box your answer. Does this answer make sense (order of magnitude?), have UNITS!!!!? , include all parts (vector or directions, etc.)? This step is to make sure your answer is complete and reasonable. Here are a few problems like the ones that you may see on the exam. 1. Suppose you have a DC ...
Electrical Symbols
... thus cutting off the current. (Some fuses are ‘re-settable’, and they may involve breaking the circuit using a springy mechanism, which can be pushed back, once the problem has been solved). Fuses protect the wiring from over-heating, and can help to protect the device itself. Diode: Basically, diod ...
... thus cutting off the current. (Some fuses are ‘re-settable’, and they may involve breaking the circuit using a springy mechanism, which can be pushed back, once the problem has been solved). Fuses protect the wiring from over-heating, and can help to protect the device itself. Diode: Basically, diod ...
01 Rectifiers
... the resistor when the diode is forward biased. If you were to measure the voltage over the resistor with an oscilloscope the wave would look like the diagram below. ...
... the resistor when the diode is forward biased. If you were to measure the voltage over the resistor with an oscilloscope the wave would look like the diagram below. ...
Question 1 - cloudfront.net
... that across the battery (ignoring losses and keeping wire resistivity to almost none), it is most appropriate to measure across the only resistor. This will assist students when additional resistors are added to the simple circuit later. This is a good time to introduce the idea of “in parallel, sam ...
... that across the battery (ignoring losses and keeping wire resistivity to almost none), it is most appropriate to measure across the only resistor. This will assist students when additional resistors are added to the simple circuit later. This is a good time to introduce the idea of “in parallel, sam ...
ET 13
... that the e.m.f per cell is raised from 1.8 to 2.2V. Determine the maximum number of carbon lamps of a parallel bank, which may be switched on in series with the circuit, so that the current from the 200V mains does not exceed 10A at the commencement of charging. If the circuit remains unaltered, cal ...
... that the e.m.f per cell is raised from 1.8 to 2.2V. Determine the maximum number of carbon lamps of a parallel bank, which may be switched on in series with the circuit, so that the current from the 200V mains does not exceed 10A at the commencement of charging. If the circuit remains unaltered, cal ...
Electrical ballast
An electrical ballast is a device intended to limit the amount of current in an electric circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps, to limit the current through the tube, which would otherwise rise to destructive levels due to the tube's negative resistance characteristic.Ballasts vary in design complexity. They can be as simple as a series resistor or inductor, capacitors, or a combination thereof or as complex as electronic ballasts used with fluorescent lamps and high-intensity discharge lamps.