A 1.50-V battery supplies 0.244 W of power to a small flashlight. If the battery

Question

A 1.50-V battery supplies 0.244 W of power to a small flashlight. If the battery moves 7.53 E 20 electrons between its terminals during the time the flashlight is in operation, how long was the flashlight used? I kind of understand how to do this but not totally. I'm given volts, electrons, and Watts. I need to ultimately plug it into the equation I= Q/T, solving for T so that the equation is T=Q/I. I know that I can find Charge (Q) by multiplying the electrons by 1.6E-19. I believe I=Watts/Volts, so .244/1.5= .1626 (I). However, when I plug these numbers in I keep getting the wrong answer. Thanks for your help.

Explanation / Answer

I=Watts/Volts = 0.244/1.5= 0.16267

t = q/i = (7.53e20*1.6e-19)/0.16267= 740.64 seconds = 12.3 minutes

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