Lectures on Physics has been derived from Benjamin Crowell's Light and Matter series of free introductory textbooks on physics. See the editorial for more information....

Number of electrons flowing through a lightbulb


If a lightbulb has 1.0 A flowing through it, how many electrons will pass through the filament in 1.0 s?


We are only calculating the number of electrons that flow, so we can ignore the positive and negative signs. Solving the definition of current, I = Δq / Δt, for Δq = I Δt gives a charge of 1.0 C flowing in this time interval. The number of electrons is

Last Update: 2010-11-11