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Electric Circuits AP Physics 1 Student Date Base your answers to questions 1 and 2 on the circuit 5. Base your answer to the following question on the diagram below which shows a battery with an circuit diagram shown below. internal resistance of 6.0 connected to a 12- and 18-ohm resistor in series. The current in the 12resistor is 0.2 A. 1. What is the potential between the two terminals of the battery? A) 1.2 V C) 6.0 V E) 10.8 V B) 2.4 V D) 7.2 V A) 1.5 C) 8 E) 19 2. What is the emf of the battery? A) 1.2 V C) 6.0 V E) 10.8 V B) 6 D) 14.4 6. In order to measure the power dissipated in a resistor of unknown value, the minimum equipment needed would be B) 2.4 V D) 7.2 V 3. A circuit element that must be put in series and has a relatively low resistance is most likely A) B) C) D) E) What is the total resistance of the circuit? an ammeter a voltmeter an ohmmeter either an ohmmeter or a voltmeter either a voltmeter or an ammeter A) B) C) D) a voltmeter only an ammeter only a voltmeter and an ammeter an ammeter, a voltmeter, and a resistor of known value E) a voltmeter and a magnet producing a known magnetic field 7. Base your answer to the following question on the part of the circuit shown below. If the potential difference between A and B is 4 V, how much charge will pass though the 4 resistor in 5 seconds? 4. If all the above resistors have a resistance of R, determine the total equivalent resistance between points A and B. A) R B) R C) R D) R A) 1 C B) 2 C C) 4 C D) 5 C E) 8 C E) R Page 1 Electric Circuits 11. A lamp, a voltmeter V, a ammeter A, and a battery with zero internal resistance are connected as shown above. Adding a second, identical lamp at point X would 8. In the diagram above, all the resistors have an identical resistance R. If the switch S is closed, the current through the resistor R1 will A) B) C) D) E) increase and the voltage will remain the same decrease and the voltage will remain the same remain the same with constant voltage remain the same but the voltage will increase remain the same but the voltage will decrease 9. Base your answer to the following question on the circuit diagram below. A) B) C) D) E) increase the ammeter reading decrease the ammeter reading increase the voltmeter reading decrease the voltmeter reading produce no change in either reading 12. Which quantities are needed to calculate the amount of energy supplied to an operating toaster? I. resistance II. applied voltage III. operating time A) II only C) I and III only E) I, II, and III B) I and II only D) II and III only 13. A resistor dissipates a power P when a current I passes through it. If the current is doubled, the power dissipated would be What is the power dissipated by the 4 A) 64 W C) 96 W E) 144 W resistor? B) 72 W D) 120 W 10. Base your answer to the following question on the diagram below which shows two resistors connected in series. A voltage V is applied to the pair. A) P B) P C) P D) 2P E) 4P 14. A falling 2 kg mass, is kept at a constant velocity and used to power a light bulb. If the light bulb requires a current of 0.5 A to run and has an internal resistance of 60 . How fast must the mass fall to power the bulb? A) 0.75 m/s C) 2 m/s E) 6 m/s B) 1.5 m/s D) 3 m/s What is the ratio of the voltage drop over R 1 to the voltage drop over R 2 when R 1 = 1.5R 2? A) B) C) 1 D) E) Page 2 Electric Circuits #1 Lightbulbs of fixed resistance 4.0 and 8.0 , a 12.0 V battery, and a switch S are connected as shown in the schematic diagram above. The switch S is closed. a. Calculate the current in bulb A. b. Which lightbulb is brightest? Justify your answer. c. Switch S is then opened. By checking the appropriate spaces below, indicate whether the brightness of each lightbulb increases, decreases, or remains the same. Explain your reasoning for each lightbulb. i. Bulb A: The brightness Explanation: increases decreases remains the same ii. Bulb B: The brightness Explanation: increases decreases remains the same iii. Bulb C: The brightness Explanation: increases decreases remains the same Page 3