10.1 Electromotive Force

Charge separation inside a battery, and terminal voltage falling below the rated emf as internal resistance takes its share under heavy load.

University Physics Volume 2, 10.1 Electromotive Force

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5 exercises

10.1 Exercise 1

If you place a wire directly across the two terminal of a battery, effectively shorting out the terminals, the battery will begin to get hot. Why do you suppose this happens?

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10.1 Exercise 2

What effect will the internal resistance of a rechargeable battery have on the energy being used to recharge the battery?

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10.1 Exercise 4

Show that the power dissipated by the load resistor is maximum when the resistance of the load resistor is equal to the internal resistance of the battery.

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10.1 Exercise 8

(a) What is the internal resistance of a voltage source if its terminal potential drops by 2.00 V when the current supplied increases by 5.00 A? (b) Can the emf of the voltage source be found with the information supplied?

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10.1 Exercise 10

A 12.0-V emf automobile battery has a terminal voltage of 16.0 V when being charged by a current of 10.0 A. (a) What is the battery’s internal resistance? (b) What power is dissipated inside the battery? (c) At what rate (in $° \text{C} / \text{min}$ ) will its temperature increase if its mass is 20.0 kg and it has a specific heat of $0.300 \text{kcal}/\text{kg} \cdot ° \text{C}$ , assuming no heat escapes?

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