An MP3 player draws a current of 0.120 ampere

from a 3.00-volt battery. What is the total charge

that passes through the player in 900. seconds?

(1) 324 C (3) 5.40 C

(2) 108 C (4) 1.80 C

1 ampere = 1 coulomb of charge per second

0.120 ampere = 0.120 coulomb of charge per second

(0.120 C/sec) x (900 sec) = 108 Coulombs.

The voltage of the battery, generator, or leiden jar

that's supplying the current is irrelevant.