Electric Power AP Physics 2 MCQ – Exam Style Questions etc.
Electric Power AP Physics 2 MCQ
Unit 11: Electric Circuits
Weightage : 15–18%
Exam Style Practice Questions ,Electric Power AP Physics 2 MCQ
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
Question
Each of the resistors shown in the circuit below has a resistance of 200 Ω. The emf of the ideal battery is 24 V.
What is the ratio of the power dissipated by R1 to the power dissipated by R4?
(A) 1/9
(B) 1/4
(C) 1
(D) 4
(E) 9
Answer/Explanation
Ans: E
The current through R4 is \(\frac{1}{3}\) the current through R1 and R4 = R1, so
\(\frac{p_{1}}{P_{4}}=\frac{I^{2}_{1}R_{1}}{I^{2}_{4}R_{4}}=\frac{I^{2}_{1}R_{1}}{\left ( \frac{1}{3}I_{1} \right )R_{1}}=9\)