Correct Response: C. Electric power is calculated by multiplying voltage by current. A voltmeter and an ammeter should be selected to determine the power used since they measure voltage and current, respectively.
The galvanometer and ammeter (A) should not be chosen. A galvanometer is essentially a sensitive ammeter, and while it can be converted to a voltmeter by adding a suitable resistor, that information is not included in the response. The galvanometer and ohmmeter (B) will not measure voltage and current since an ohmmeter is used for measuring resistance. The ohmmeter and voltmeter (D) will measure voltage and resistance, respectively.
