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Transcript
Electric Currents and Circuits Review How much work is done to transfer 0.18 C of charge through a potential difference of 12 volts? Ans. 2.16 J A spark will jump through dry air when the electric field is larger than 1000 volts/m. If two parallel plates have a potential difference of 5000 V, what is the minimum distance between them to prevent discharge? Ans. 5 m A certain X-ray tube uses 125,000 volts to accelerate electrons to produce X-rays. What is the kinetic energy of the electrons just before they strike the tungsten metal? Ans. 2 x 10-14 J Which of the following arrangements of three identical resistors will produce the lowest value of current through the battery? Ans. A Which of the following arrangements of three identical resistors will produce the largest value of current through the battery? Ans. C Which graph could represent I vs. V in a simple circuit? Ans. C What is the current in the circuit? V 60 V A2 A1 10 Ans. 3 A 10 An electric heater draws 15 A when connected to a 120 V source. It is operated for 5 hours every day. At a cost of $0.08 per kWh, how much does it cost to operate the heater for 30 days? (1kWh = 3.6 106 J) Ans. $21.60 What is the voltage drop across the left resistor? V 60 V A2 A1 10 Ans. 30 V 10 If R3 is 150 , what is the current through it? R2 80 V R1 240 A Ans. 0.53 A 1A R3 V What is R1? R2 80 V R1 240 A Ans. 80 1A R3 V While stringing a line of Christmas tree lights you notice that one of the bulbs has burned out. The rest of the bulbs remain lit. The bulbs must be wired in • Series • Parallel • Cannot be determined Ans. parallel What is the power dissipated by R2? R2 80 V R1 240 A Ans. 26.7 W 1A R3 V What is the current through the 5 resistor? 10 5 100 V 15 Ans. 3.33 A What is the total resistance of this circuit? 10 5 100 V 15 Ans. 30 What is the voltage V2? 60 V Ans. 60 V 10 5 15 What is the voltage drop V3? 10 5 100 V 15 Ans. 50 V What is the total resistance of this circuit? 60 V Ans. 2.73 10 5 15 What is the current in the rightmost branch? 60 V Ans. 4 A 10 5 15 Which diagram shows a possible flow of current in part of a circuit? Ans. A What is the current through the battery in this circuit? 60 V Ans. 22 A 10 5 15 An electrical heater raises the temperature of a bucket of water. If 6000 J of energy is absorbed by the water from the heater in 30 s, what is the minimum power rating of the heater? Ans. 200 W Which circuit shows the correct setup for the ammeter and voltmeter in a parallel circuit? Ans. B