What unit measures electromotive force in an electrical circuit?

• A. Amps
• B. Ohms
• C. Volts
• D. Watts

Answer: (C)

Electromotive force (EMF) in an electrical circuit is measured in volts. This measurement reflects the potential difference that drives electric current through a circuit, essentially indicating how much energy is available to push electrons through the circuit's components.

To further understand the context, amps measure the flow of electric current, while ohms gauge resistance to that current. Watts, on the other hand, are a measure of power, which is the rate at which energy is used or transferred in a circuit. Thus, when identifying what measures electromotive force, volts are the unit that directly corresponds to the potential energy per charge—a fundamental concept in understanding how electrical systems operate.