Which unit measures the current, defined as the number of electrons that move past a point in one second?

Which unit measures the current, defined as the number of electrons that move past a point in one second?

• A. Volts
• B. Amperes (amps)
• C. Ohms
• D. Power

Answer: (B)

Current is the rate at which electric charge passes a point in a circuit. The unit that measures this flow is the ampere, defined as one coulomb of charge moving past a point each second. Since one coulomb equals about 6.242×10^18 electrons, an electric current of one ampere corresponds to roughly 6.24×10^18 electrons per second. The other options refer to different quantities: volts measure electric potential, ohms measure resistance, and watts measure power. Hence, the unit that matches the description is the ampere.

Current is the rate at which electric charge passes a point in a circuit. The unit that measures this flow is the ampere, defined as one coulomb of charge moving past a point each second. Since one coulomb equals about 6.242×10^18 electrons, an electric current of one ampere corresponds to roughly 6.24×10^18 electrons per second. The other options refer to different quantities: volts measure electric potential, ohms measure resistance, and watts measure power. Hence, the unit that matches the description is the ampere.