Current is measured in units called

• A. volts
• B. amperes
• C. ohms
• D. watts

Answer: (B)

Current is the flow of electric charge through a conductor, and its size is measured in amperes. An ampere is defined as one coulomb of charge passing a point each second, so the amount of charge crossing per second determines the current value. In practice, an ammeter is used to measure this current by placing it in series with the circuit so it doesn’t significantly alter the flow.

Understanding the other terms helps connect the idea: volts measure electrical potential difference, the push that drives charges; ohms measure resistance, which is how much a component resists the flow; watts measure power, the rate at which energy is transferred or used, which equals voltage times current. Thus, the unit for current is amperes.