Problems-Electric Current P 17-1. Batteries power much of our modern mobile life

Question

Problems-Electric Current P 17-1. Batteries power much of our modern mobile lifestyle. AA batteries are often rated in units of milliampere-hours (mAh). This unit is actually a measure of the charge that the battery contains, and may be converted directly to coulombs by the formula 1 mAh = 3.6 C. How many coulombs of charge are contained in a AA battery rated at 1500 mAH? P17?2. Thirty-five coulombs of charge flow through a wire in 2 minutes. Determine the current in the wire. P17-3. If 2 mA of current flow in your mp3 player, how long will it take for 1C of charge to flow?

Explanation / Answer

17-1)
1mAh=3.6C

for 1500mAh

charge in coulombs=1500*3.6

=5400C

17-2)

Q=it

i=35/2*60

=0.291A

17-3)

Q=it

t=1/2*10-3

=500seconds

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