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.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.