Problem 1: A battery has an emf of 12.8 V and supplies a current of 3.2A. What is the resistance of the circuit? How many coulombs leave the battery in 5 minutes?

Solution

Given emf = 12.8 V I = 3.2 A

t = 5 minutes = 5 * 60 = 300 seconds

Required Resistance of the circuit, R =?

Charge passed = Q =?

By Ohm’s law V = IR .

Put the values

For finding the amount of charge Q, we use the definition of current.

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