National 5 (Scotland) · National 5 Physics

Electricity and Energy

8 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 8 questions

  1. How should an ammeter and a voltmeter be connected to measure the current through and the voltage across a resistor?
  2. A graph of current against voltage for a resistor at constant temperature is a straight line through the origin. What does this show?
  3. An appliance rated at 2.3 kW operates at 230 V. Which fuse should be fitted: 3 A, 5 A or 13 A?
  4. What happens to the resistance of a thermistor (NTC) as its temperature increases?
  5. A 10 Ω resistor is in series with a parallel pair of 6 Ω and 3 Ω across a 24 V supply. What is the voltage across the parallel pair?
  6. An LED needs 2.0 V and 20 mA. It is connected in series with a resistor to a 6.0 V supply. What resistor value is required?
  7. Mains electricity in the UK has what values?
  8. A 2.0 kW heater is used to heat 4.0 kg of water by 15 °C. The water has c = 4180 J/kg/°C. Assuming no energy loss, how long does it take?

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