Past Paper

Question 1

What is the correct way to connect the ammeter and the voltmeter into the circuit?

Answer 1

ammeter in series with the resistor, voltmeter in parallel with the resistor

Question 2

Name the type of relationship between current and potential difference for a resistor at constant temperature

Answer 2

Directly proportional

Question 3

Write the equation which links current, potential difference and resistance

Answer 3

V = I X R

Question 4

The current in the resistor was 0.12A when the potential difference across the resistor was 3.0V. Calculate the resistance of the resistor.

Answer 4

3/0.12=25

Question 5

Mains electricity is an ac supply.
Explain the difference between direct and alternating potential difference.

Answer 5

direct potential difference is always in the same direction
alternating potential difference changes direction

Question 6

Explain why it is better to use a cable with a low resistance than to use a cable with a high resistance.

Answer 6

lower potential difference across the cable
it is more efficient.