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## Homework Statement

A car battery has an open-circuit terminal voltage of 12.6 volts. The voltage drops to 10.8 volts when the battery supplies 240 amps to the car's starter motor. What is the Thevenin eq for this battery?

## Homework Equations

I think the root of my problem is the setup of the equation. I just don't understand how to setup the circuit prperly. Am I looking for it to have a t>0 or t<0 setup? There just doesn't seem to be one solution for this problem. Should I be looking for an answer in the voltage drop?

## The Attempt at a Solution

Rth=Vth/Isc=10.8/240=.045Ohms

but

Rth=Vth/Isc=12.6/240=.0525Ohms

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