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# Billions In The Blink Of An Eye

#### Shared by David Mattingly

A 60W light bulb is connected to a 120V 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.
3 tries left ·
* Use decimal answers like 3.001 or 6E-10 for 6×10-10. Enter answers to three significant figures – you will not be penalized for too many significant figures.