Approximately how many electrons pass a cross-section each second when an electric current of 1 A flows?

Explanation

A current of 1 A transfers 1 C each second. Dividing by the elementary charge, approximately 1.602 × 10⁻¹⁹ C, gives about 6.24 × 10¹⁸ electrons per second, conventionally rounded to 6.25 × 10¹⁸ in the options.