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Prelab 3: The following circuit demonstrates the correct way to connect two car batteries together for the purposes of charging the bad battery. Good r1 Bad r2 Battery Battery Jumper Cables Figure 16: A single loop circuit illustrating the correct way to charge a car battery. Here we are modeling a real battery by having an ideal battery that supplies a voltage E in series with a resistance r. Real batteries have some internal resistance. In a real battery, the internal resistance r occurs simultaneously with the voltage rise E, not separately as shown in the diagram above. The jumper cables will also have some small resistance R a.) Apply Kirchhoffs Laws to this circuit to find the current in the circuit. (Hint, Use the six-step procedure given in the Background Information” section of this lab entitled Kirchhoffs Laws of Circuit Analysis.) b.) As the bad battery charges, E2 approaches E1. What happens to the current? c.) Use the current you found in Part (a) to find the voltage drops across the resistors r1, r2 and R.

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