Which SI unit measures electric current?

Which SI unit measures electric current?

• A. Ampere (A)
• B. Kelvin (K)
• C. Candela (cd)
• D. Second (s)

Answer: (A)

The key idea is that electric current is the rate at which electric charge flows through a point. The unit that directly measures this flow is the ampere. By definition, one ampere means one coulomb of charge passes a given point every second, linking the concept of flow with a concrete unit. The other options measure different quantities: Kelvin is temperature, Candela is luminous intensity, and the second is time. So the ampere is the appropriate unit for current.

The key idea is that electric current is the rate at which electric charge flows through a point. The unit that directly measures this flow is the ampere. By definition, one ampere means one coulomb of charge passes a given point every second, linking the concept of flow with a concrete unit. The other options measure different quantities: Kelvin is temperature, Candela is luminous intensity, and the second is time. So the ampere is the appropriate unit for current.