AP Physics 1 Multiple Choice Questions - Chapter 12
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1 1 If a current of 125 ma exists in a metal wire, how many electrons flow past a given cross section of the wire in 10 minutes? a 6.25 x electrons b 3.98 x electrons c 5.35 x electrons d 4.66 x electrons 2 A wire carries a current of 1.6A. How many electrons per second pass a given point in the wire? Choose the best estimate. a b c d e A proton beam in an accelerator carries a current of 125 microamps. If the beam is incident on a target, how many protons strike the target in a period of 23.0 seconds? a 1.8 x protons b 3.5 x protons c 1.4 x protons d 8.5 x protons Updated 9/2/2018 Boyceville High School, Mr. Hamm Page 1 of 7
2 1 An electric heater carries a current of 12 A when operating at a voltage of 120 V. what is the resistance of the electric heater? a 100 ohms b 10 ohms c 1000 ohms d 0.1 ohms 2 Wire B has the same resistivity, twice the legnth, and twice the radius of wire A. If wire A has a resistance R, what is the resistance of wire B? a 4R b 2R c R d R/2 e R/4 3 Three wires are made of copper having circular cross sections. Wire 1 has a length L and a radius r. Wire 2 has a length L and a radius 2r. Wire 3 has a length 2L and a radius 3r. Which wire has the smallest resistance? a Wire 1 b Wire 2 c Wire 3 d All three wires have the same resistance e Not enough information given to answer the question Updated 9/2/2018 Boyceville High School, Mr. Hamm Page 2 of 7
3 Using the circuit shown above, and assuming that A = 10 ohms and B = 20 ohms, calculate the equivalent resistance a 195 ohms b ohms c 4.65 ohms d ohms 2 Three resistors, A, B, and C, are connected in parallel and attached to a battery, with the resistance of A being the smallest and the resistance of C being the greatest. Which resistor carries the highest current? a A b B c C d All wires carry the same current e More information is needed to answer the question 3 Three resistors, A, B, and C, are connected in series in a closed loop with a battery, with the resistance of A being the smallest and the resistance of C the greatest. Across which resistor is the voltage drop the greatest? a A b B c C d The voltage drops are the same for each e More information is needed to answer the question Updated 9/2/2018 Boyceville High School, Mr. Hamm Page 3 of 7
4 In the circuit shown above, the sum of the resistances of resistors R 1 and R 2 is 8 Ω. What is the current through the battery? a 4 A b 5 A c 8 A d 20 A A 9.0 V battery and two resistors are connected in the circuit shown above. The current through the 3.0 Ω resistor is 2.0 A. What is the potential difference across resistor R 2? a 9.0 V b 6.0 V c 3.0 V d 1.5 V A 45 V battery and three resistors are connected in the circuit shown above. What is the current passing through the circuit? a 2 A b A c A d 5 A Updated 9/2/2018 Boyceville High School, Mr. Hamm Page 4 of 7
5 In the circuit shown above, the sum of the resistances of resistors R 1 and R 2 is 8 Ω. Resistor R 1 and the 2Ω resistor are now swapped. How does the current in the a b c d right branch of the circuit change, and why? The current does not change, because the total resistance does not change The current increases, because the total resistance will always decrease The current decreases, because the total resistance will always increase The change in current cannot be determined without knowing the resistances of R 1 and R 2. Updated 9/2/2018 Boyceville High School, Mr. Hamm Page 5 of 7
6 The above table shows the potential difference and current for each circuit element in a circuit consisting of a battery and three resistors. Which of the following diagrams could represent the circuit? Updated 9/2/2018 Boyceville High School, Mr. Hamm Page 6 of 7
7 A DC circuit is set up as shown above. What is the power dissipated in the third resistor R 3? a 222 mw b 24 mw c 85 mw d 14 mw Updated 9/2/2018 Boyceville High School, Mr. Hamm Page 7 of 7
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