If 6.25 x 10^18 electrons pass a point in one second, the current is approximately?

If 6.25 x 10^18 electrons pass a point in one second, the current is approximately?

• A. 0.1 ampere
• B. 10 amperes
• C. One ampere
• D. 0.01 ampere

Answer: (C)

Current is the rate at which charge flows past a point. Each electron carries about 1.602 × 10^-19 coulombs. Multiply by the number of electrons per second: 6.25 × 10^18 × 1.602 × 10^-19 C ≈ 1.0 C per second. Since current is coulombs per second, the result is about 1 ampere. In other words, roughly one coulomb of charge passes each second, which corresponds to one ampere of current.

Current is the rate at which charge flows past a point. Each electron carries about 1.602 × 10^-19 coulombs. Multiply by the number of electrons per second: 6.25 × 10^18 × 1.602 × 10^-19 C ≈ 1.0 C per second. Since current is coulombs per second, the result is about 1 ampere. In other words, roughly one coulomb of charge passes each second, which corresponds to one ampere of current.