# Billions In The Blink Of An Eye

Electricity and Magnetism Level 2

A 60-Watt light bulb is connected to a 120 V outlet. How long in seconds does it take for 1 billion ($$10^{9}$$) electrons to pass through the light bulb?

Details and assumptions

• The charge of the electron is $$e=1.6\times 10^{-19}~\mbox{C}$$.
• You may consider the voltage as a constant voltage source. The time you will find is short enough that the fact that wall outlets generally deliver alternating voltages can be ignored.
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