Which unit is used to measure electric current?

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

Answer: (A)

Electric current is the rate at which electric charges flow through a conductor. The unit for that flow is the ampere (amp). One ampere means one coulomb of charge passes a point each second, so when you see current expressed in amps, it’s describing how much charge is moving every second. This is why the correct answer uses amps. The other terms describe related but different quantities: volts measure potential difference that drives the flow, ohms measure resistance to the flow, and watts measure the rate of power transfer, which depends on both current and voltage. For example, with a 1-volt source across a 1-ohm resistor, the current is 1 amp, illustrating how current, not voltage or resistance, is what amps quantify.