Find the number of electrons of the passed charge using an electric lamp in 30 seconds. current strength 0.2 A

To find the required number of electrons that passed through the used electric lamp, we apply the formula: I = q / t = qе * n / t, whence we express: n = I * t / qе.

Constant and variable: I – current in an electric lamp (I = 0.2 A); t – elapsed time (t = 30 s); qе – electron charge (qе = -1.6 * 10 ^ -19 C).

Calculation: n = I * t / qе = 0.2 * 30 / (1.6 * 10 ^ -19) = 3.75 * 10 ^ 19 electrons.

Answer: In 30 seconds, 3.75 * 10 ^ 19 electrons passed through the used electric lamp.