Which two electrical quantities are multiplied to obtain electrical power in a DC circuit?

• A. Current and resistance
• B. Voltage and resistance
• C. Voltage and current
• D. Capacitance and inductance

Answer: (C)

Power is the rate at which energy is transferred, and in a DC circuit it’s found by multiplying the voltage across an element by the current through it: P = V × I. This product directly measures how much energy per second is delivered to or dissipated by the component. If you apply Ohm’s law for a resistor, you can also write power as I^2R or V^2/R, showing the same relationship from different perspectives.

Current times resistance gives voltage, not power, and voltage times resistance doesn’t represent a standard power quantity. Capacitance and inductance describe energy storage and transient behavior, not the basic DC power calculation.