Lesson 6.2.4.1
6.2.4.1 Power Quiz: AQA Combined Science, Unit 19
20 questions
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Lesson 6.2.4.1, Power: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 19: Electricity, written with Revision Ninja.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
Which equation links power to potential difference and current?
- P = V x I
- P = V - I
- P = V / I
- P = V + I
-
What is the unit of power?
- Joule
- Watt
- Ohm
- Volt
-
Which equation gives power in terms of current and resistance?
- P = I^2 x R
- P = I x R^2
- P = I + R
- P = I / R
-
In the electrical power equation P = I squared R, what does R stand for?
- Radiation
- Resistance
- Reactance
- Resonance
-
Which quantity is measured in amperes?
- Current
- Power
- Potential difference
- Resistance
-
Power is best described as the rate of:
- Potential difference change.
- Resistance change.
- Charge flow.
- Energy transfer.
-
Which unit is used for potential difference?
- Volt
- Ohm
- Coulomb
- Watt
-
For a fixed resistance, what happens to power when the current doubles?
- Halves
- Quadruples
- Stays the same
- Doubles
-
A device has a potential difference of 230 V and a current of 5 A. What is its power?
- 2300 W
- 235 W
- 1150 W
- 46 W
-
A heater draws 10 A from a 230 V supply. What is its power?
- 230 W
- 4600 W
- 23 W
- 2300 W
-
A 10 ohm resistor carries a current of 2 A. What power does it dissipate?
- 20 W
- 40 W
- 400 W
- 5 W
-
A 4 ohm resistor carries 3 A. What is the power dissipated in the resistor?
- 12 W
- 7 W
- 36 W
- 108 W
-
A lamp has a power of 60 W at 12 V. What current does it draw?
- 48 A
- 5 A
- 72 A
- 0.2 A
-
A device draws 0.5 A and has a power of 115 W. What is its potential difference?
- 460 V
- 115 V
- 230 V
- 57.5 V
-
For a fixed resistance, the current through a device doubles. By what factor does its power change?
- 2
- 0.5
- 1
- 4
-
A 2 kW appliance runs at 230 V. Which current does it draw, to one decimal place?
- About 8.7 A
- About 460 A
- About 2.3 A
- About 0.1 A
-
Device A draws 2 A and device B draws 4 A, both at 230 V. What is the ratio of power for B to A?
- 4 : 1
- 1 : 1
- 2 : 1
- 1 : 2
-
Which rearrangement gives the current in a device from its power and potential difference?
- I = P x V
- I = V / P
- I = P - V
- I = P / V
-
A resistor carries a current of 4 A and has a power of 400 W. What is its resistance?
- 10 ohms
- 1600 ohms
- 100 ohms
- 25 ohms
-
A device of resistance 8 ohms carries 2 A for 30 s. How much energy does it transfer?
- 64 J
- 480 J
- 960 J
- 16 J
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