The charge on an electron is known to be 1.6 x 10^-19 coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second?
- A. 1.6 x 10^19
- B. 1.6 x 10^-19
- C. 0.625 x 10^19
- D. 0.625 x 10^12.
Answer: C. 0.625 x 10^19
Explanation: I = q/t = n·e/t. For I = 1 A and t = 1 s: n = 1 / (1.6 × 10⁻¹⁹) = 0.625 × 10¹⁹ electrons per second.