How many electrons pass through a 20-Ω resistor in 10 min if there is a potential drop of 30 volts across it? A)5.6 × 10²¹ B)7.5 × 10²¹ C)9.4 × 10²¹ D)1.1 × 10²¹ E)3.8 × 10²¹

Question

Quizplus · Accepted Answer

First, calculate the current using Ohm's Law: I = V/R = 30V/20Ω = 1.5A. Then, find the total charge: Q = I × t = 1.5A × 600s = 900C. Finally, calculate the number of electrons: number of electrons = Q/e = 900C / 1.6 × 10^-19 C/electron ≈ 5.6 × 10^21 electrons.

How Many Electrons Pass Through a 20-Ω Resistor in 10