Worksheet: Cables and Plugs

In this worksheet, we will practice describing how to wire a plug.

Q1:

A standard UK plug has three wires.

What color is the neutral wire?

  • AGreen and yellow
  • BBrown
  • CGreen
  • DBlue
  • EYellow

What color is the live wire?

  • ABrown
  • BGreen
  • CGreen and yellow
  • DBlue
  • EYellow

What color is the earth wire?

  • AYellow
  • BBrown
  • CGreen and yellow
  • DGreen and yellow
  • EGreen

Q2:

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

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

Q3:

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

  • ASulfur
  • BArgon
  • CUranium
  • DCopper
  • EPotassium

Q4:

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 d
  • Ba and b
  • Cd and e
  • Dc and e
  • Ea and e

Why is plastic used as the coating for the wire?

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

Q5:

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

  • AThe earth wire provides the alternating potential difference that powers the device.
  • BThe earth wire completes the circuit of the device.
  • CThe 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.

Q6:

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

  • AThe 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.
  • BThe neutral wire provides the alternating potential difference that powers the device.
  • CThe neutral wire completes the circuit of the device. The potential difference between the neutral wire and earth is 0 V.

Q7:

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

Q8:

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

Q9:

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

Q10:

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

  • ARectified alternating current
  • BAlternating current
  • CPulsating current
  • DDirect current
  • EVariable current

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