Question 8

The battery in the circuit diagram below has an emf of 12 V and an internal resistance
of 0,5 Ω. Resistor R has an unknown resistance.

8.1 What is the meaning of the following statement?
The emf of the battery is 12 V. (2)

The reading on the ammeter is 2 A when switch S is OPEN.

8.2 Calculate the:

8.2.1 Reading on the voltmeter (3)

8.2.2 Resistance of resistor R (2)

Switch S is now CLOSED.

8.3 How does this change affect the reading on the voltmeter? Choose from:
Explain the answer. (4)


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