When a current of 1 A flows in a circuit, how many electrons pass through it each second?
Correct answer B. 0.625 × 10^19
Explanation
One ampere is one coulomb per second, and each electron carries 1.6 × 10^-19 C, so the number is 1/(1.6 × 10^-19) = 6.25 × 10^18, which is 0.625 × 10^19.
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