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Lesson: Cables and Plugs

Sample Question Videos

Worksheet • 10 Questions • 1 Video

Q1:

In a standard UK plug, what is the potential difference between the live wire and the neutral wire?

Q2:

In a standard UK plug, what is the potential difference between the neutral wire and earth?

Q3:

In a standard UK plug, what is the potential difference between the live wire and earth?

Q4:

Which of the following statements correctly explains the purpose of the earth wire in a standard UK plug?

  • AThe earth wire completes the circuit of the device.
  • BThe earth wire is for safety; it prevents the casing of the device from becoming live. It only carries a current when there is a fault.
  • CThe earth wire provides the alternating potential difference that powers the device.

Q5:

Electrical wires are often made of a copper core covered in a thin plastic coating.

Which of the following are reasons why copper is chosen as the material for the core of the wire?

  1. It is a good thermal conductor.
  2. It is very cheap.
  3. It is ductile.
  4. It is very light.
  5. It is a good electrical conductor.
  • Ac and e
  • Ba and e
  • Ca and b
  • Dd and e
  • Ec and d

Why is plastic used as the coating for the wire?

  • ABecause it is an electrical insulator
  • BBecause it is ductile
  • CBecause it is a good electrical conductor
  • DBecause it is easy to make into different colors
  • EBecause it is a good thermal conductor

Q6:

What type of electrical current is provided by UK mains electricity?

  • AAlternating current
  • BVariable current
  • CDirect current
  • DPulsating current
  • ERectified alternating current

Q7:

A standard UK plug has three wires.

What color is the neutral wire?

  • ABlue
  • BYellow
  • CBrown
  • DGreen
  • EGreen and yellow

What color is the live wire?

  • ABrown
  • BYellow
  • CBlue
  • DGreen
  • EGreen and yellow

What color is the earth wire?

  • AGreen and yellow
  • BYellow
  • CBrown
  • DGreen
  • EGreen and yellow

Q8:

Which of the following materials is suitable for use as an electrical wire?

  • ACopper
  • BPotassium
  • CArgon
  • DUranium
  • ESulfur

Q9:

What type of electrical current is provided by a 1.5 V alkaline battery?

  • ADirect current
  • BVariable current
  • CAlternating current
  • DPulsating current
  • ERectified alternating current

Q10:

Which of the following statements correctly explains the purpose of the neutral wire in a standard UK plug?

  • AThe neutral wire provides the alternating potential difference that powers the device.
  • BThe neutral wire completes the circuit of the device. The potential difference between the neutral wire and earth is 0 V.
  • CThe neutral wire is for safety. It prevents the casing of the device from becoming live. It only carries a current when there is a fault.
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