Lesson 4.2.4.1
4.2.4.1 Power Quiz: AQA Physics, Unit 2
20 questions
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Lesson 4.2.4.1, Power: 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 2: Electricity, written with Revision Ninja.
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The 20 questions
-
Which equation correctly calculates electrical power using potential difference and current?
- P = V I
- P = E / t
- P = I / V
- P = I squared R
-
Which equation calculates electrical power using current and resistance?
- P = V I
- P = V squared / R
- P = I squared R
- P = I R
-
What is the unit of electrical power?
- Joule (J)
- Ampere (A)
- Ohm (ohm)
- Watt (W)
-
A device has a potential difference of 12 V and a current of 2 A. What is its power?
- 14 W
- 6 W
- 24 W
- 0.17 W
-
A resistor of 5 ohms carries a current of 3 A. What is the power dissipated?
- 15 W
- 1.67 W
- 8 W
- 45 W
-
A lamp draws 0.5 A from a 230 V supply. What is its power?
- 230.5 W
- 0.002 W
- 460 W
- 115 W
-
A heater has a resistance of 20 ohms and carries a current of 4 A. What is its power?
- 80 W
- 320 W
- 24 W
- 5 W
-
A device is rated at 1000 W and runs on 230 V. What current does it draw?
- About 230 A
- About 1000 A
- About 4.3 A
- About 0.23 A
-
A component has power 18 W and current 3 A. What is its potential difference?
- 54 V
- 6 V
- 21 V
- 15 V
-
By what factor does power increase when current through a fixed resistor doubles?
- Eight
- Sixteen
- Four
- Two
-
What happens to the power of a fixed resistor when its potential difference doubles?
- Halves
- Quadruples
- Doubles
- Stays same
-
Which pair of readings gives the same power as 12 V and 2 A?
- 6 V and 4 A
- 12 V and 4 A
- 6 V and 2 A
- 4 V and 4 A
-
A kettle transfers 2 kJ of energy in 4 s. What is its power?
- 500 W
- 8000 W
- 2000 W
- 50 W
-
What is the energy transferred by a 60 W lamp left on for 10 minutes?
- 600 J
- 360000 J
- 36000 J
- 3600 J
-
What is the power of a motor operating at 12 V and 2 A?
- 14 W
- 48 W
- 24 W
- 6 W
-
A fixed resistor has a power of 10 W. If its current is doubled, what is the new power?
- 20 W
- 5 W
- 10 W
- 40 W
-
A 10 ohm resistor carries a current of 1.5 A. How much energy does it transfer in 20 s?
- 450 J
- 30 J
- 1350 J
- 225 J
-
An electric fan runs at 40 W on a 12 V supply. What current does it draw?
- 480 A
- About 52 A
- About 3.3 A
- About 0.3 A
-
Which two variables determine the electrical power of a circuit device?
- Potential difference and current
- Resistance and charge
- Energy and time
- Current and resistance
-
What is the power rating of a device that transfers 900 J every 3 s?
- 2700 W
- 900 W
- 300 W
- 0.003 W
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