Current is measured in which unit?

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

Answer: (A)

Current is the flow rate of electric charge through a conductor. The unit that expresses that flow rate is the ampere, defined as one coulomb passing a point each second. In practical terms, the ampere tells you how much charge is moving in a circuit, which is what an ammeter measures. Other electrical properties have different units: voltage is the electrical pressure that pushes charges, measured in volts; resistance is the opposition to flow, measured in ohms; power is the rate of doing work, measured in watts and related by P = V × I. In a sheet metal shop, understanding amperage helps you gauge motor and welding equipment performance, heat, and protective device sizing.