AP® Physics C: E&M - Electric Power - MCQs
Questions
Four resistors, all with the same resistance R, are connected as shown above. If the power supply produces 10 V and the resistance R is \(5\Omega \), what is the current in resistor \(R_{4} \) ?
(A) 15 A
(B) 5 A
(C) 2 A
(D) 1/2 A
(E) 1/5 A
▶️Answer/Explanation
Ans: C
Questions
Copper wire A has twice the length and half the diameter of copper wire B, but carries the same current I. If P is the rate at which energy is dissipated in wire B, what is the rate at which energy is dissipated in wire A?
(A) \(\frac{1}{8}P\)
(B) \(\frac{1}{4}P\)
(C) P
(D) 4P
(E) 8P
▶️Answer/Explanation
Ans: E
Questions
Two 9 V batteries and three identical \(600\Omega \) resistors are connected in a circuit, as shown above. Neglect internal resistance in the batteries and consider all meters to be ideal. What is the total power dissipated in the three
resistors?
(A) 0.023 W
(B) 0.045 W
(C) 0.090 W
(D) 0.36 W
(E) 9.0 W
▶️Answer/Explanation
Ans: C