Problem 1:  A cell phone battery uses chemistry to create a charge separation between the terminals (anode and cathode). Such a battery is listed as having a capacity of Q = 7.5E-08 C.  Part (a)  How many free electrons does the battery contain, N? Part (b)  If there are 1.0 million electrons moving through the phone every second how long will the battery last in seconds? Part (c)  Current, I, is given in amps which are coulombs per second. What is the current passing through the phone?

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.