MCAT Physics Question 72: Answer and Explanation
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Question: 72
12. A certain 9 V battery is used as a power source to move a 2 C charge. How much work is done by the battery?
- A. 4.5 J
- B. 9 J
- C. 18 J
- D. 36 J
Correct Answer: C
Explanation:
Voltage (ΔV) is equal to the quotient of the amount of work done (W) divided by the charge of the particle on which the work is done (q), according to the equation 
Because the voltage equals 9 V and the charge equals 2 C, the work done must equal 9 V × 2 C = 18 J.