Lesson 6.2.3.2
6.2.3.2 Mains electricity Quiz: AQA Combined Science, Unit 19
20 questions
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Lesson 6.2.3.2, Mains electricity: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 19: Electricity, written with Revision Ninja.
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The 20 questions
-
Which insulation colour identifies the live wire in a UK three-core cable?
- Red
- Green and yellow
- Blue
- Brown
-
Which insulation colour identifies the neutral wire in a UK three-core cable?
- Green and yellow
- Brown
- Black
- Blue
-
What is the insulation colour scheme for the earth wire in a three-core cable?
- Black and red
- Plain brown strips
- Green and yellow
- Brown and blue
-
Under normal operating conditions, when does the earth wire carry a current?
- Always
- During high power
- Never
- When switched on
-
What is the approximate potential of the neutral wire?
- 230 V
- 0 V
- 50 V
- 115 V
-
What is the potential difference between the live wire and earth in UK mains?
- About 230 V
- About 50 V
- About 400 V
- 0 V
-
What is the primary safety purpose of the earth wire in an appliance?
- Prevent casing live
- Store extra charge
- Increase resistance
- Lower mains voltage
-
Which wire carries the alternating potential difference from the supply?
- Casing
- Live
- Neutral
- Earth
-
Why can an open mains switch still leave the live wire dangerous?
- Grounded current
- Zero potential
- Mains potential
- Neutral voltage
-
What hazard is caused by providing a direct connection between live and earth?
- Reversed polarity
- Zero potential difference
- Very large current
- Complete power loss
-
A fault connects live to a metal kettle casing with a broken earth. What is the risk?
- Casing at 230 V
- Casing at 0 V
- Fuse failure only
- Battery explosion
-
What current normally flows through the earth wire of an appliance?
- 13 A
- Zero
- 50 A
- 230 A
-
What does the earth wire do when a live wire touches the metal casing?
- Carries fault current
- Completes the circuit
- Stores electrical charge
- Increases the voltage
-
Why is the neutral wire kept at or close to 0 V?
- Connected to live
- Connected to earth
- Made of copper
- Insulated with blue
-
A three-core cable has a live wire at 230 V and a neutral wire at 0 V. What is the potential difference between live and neutral?
- 460 V
- 115 V
- 230 V
- 0 V
-
What is the potential of the neutral wire compared to the live wire?
- Exactly equal
- Much higher
- Much lower
- Always negative
-
Why do the three mains wires have standardised insulation colours?
- Increasing flexibility
- Reducing resistance
- Easy identification
- Preventing corrosion
-
What is the approximate potential difference between live and neutral in UK mains?
- 400 V
- 12 V
- 230 V
- 100 V
-
Why can an open switch still leave the live wire dangerous?
- Neutral wire leaks
- Supply side live
- Earth wire fails
- Current jumps gap
-
Which wire completes the circuit for current in normal use?
- Fuse
- Earth
- Casing
- Neutral
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