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## Homework Statement

A constant current of 3 A for 4 hours is required to charge an automotive battery. If the terminal voltage is 10 + t/2 Volts, where t is in hours, how much energy is expended? (dw)

## Homework Equations

i = dq/dt

v= dw/dq (w = work in joules)

p = iv

## The Attempt at a Solution

[PLAIN]http://img203.imageshack.us/img203/2080/67548281.jpg [Broken]

please advise

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