Lesson 4.2.3.2
4.2.3.2 Mains electricity Quiz: AQA Physics, Unit 2
20 questions
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Lesson 4.2.3.2, Mains electricity: 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 2: Electricity, written with Revision Ninja.
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The 20 questions
-
What are the three core wires in a standard UK mains cable?
- Live, neutral, earth
- Positive, negative, neutral
- Phase, return, safety
- Active, passive, ground
-
What colour insulation covers the live wire in a UK mains cable?
- Black
- Blue
- Green and yellow
- Brown
-
What colour insulation covers the neutral wire in a UK mains cable?
- Blue
- Brown
- Green and yellow
- Red
-
What colour insulation covers the earth wire in a UK mains cable?
- Solid green
- Brown and blue
- Black and white
- Green and yellow
-
What is the primary function of the earth wire in a mains appliance?
- Completes the circuit
- Carries live current
- Prevents live casing
- Increases resistance
-
What is the potential difference between the live wire and earth?
- About 0 V
- About 400 V
- About 115 V
- About 230 V
-
At what potential is the neutral wire in a UK mains circuit?
- 230 V
- Close to 0 V
- 110 V
- 400 V
-
Why can a live wire remain dangerous when the circuit switch is open?
- It reverses polarity
- It stays at 230 V
- It becomes neutral
- It drops to 0 V
-
Why is a direct connection between the live wire and earth dangerous?
- Reverses the current
- Stops all power
- Creates large current
- Lowers the voltage
-
What happens if a fault connects the live wire to an earthed metal casing?
- Battery dies
- Fuse blows
- Bulb brightens
- Switch closes
-
What current does the earth wire carry under normal operating conditions?
- A steady 5 A
- Zero current
- Maximum mains current
- Alternating 50 Hz
-
Which wire returns current to the supply under normal operation?
- Live
- Earth
- Brown
- Neutral
-
What is the normal potential difference of the neutral wire in a mains circuit?
- 0 V
- 400 V
- 50 V
- 230 V
-
What is the potential difference across the earth wire under normal conditions?
- 230 V
- 0 V
- 115 V
- 50 V
-
What is the approximate potential difference of the neutral wire relative to earth?
- About 230 V
- About 50 V
- About 0 V
- About 115 V
-
Which wire carries fault current to the earth to protect the appliance user?
- Neutral wire
- Switch wire
- Earth wire
- Live wire
-
Which wire carries the alternating potential difference from the mains supply?
- Neutral wire
- Core wire
- Earth wire
- Live wire
-
Why can an appliance still be hazardous even when switched off?
- Earth wire disconnected
- Live wire connected
- Fuse melted
- Neutral wire active
-
What is the primary safety purpose of connecting the earth wire to a metal casing?
- Increases appliance power
- Reduces electrical noise
- Completes standard circuit
- Prevents casing shocks
-
When does current normally flow through the earth wire of an appliance?
- Never
- When switched on
- Always
- Only during faults
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