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Mains electricity

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Question 6

This question is about electricity.

a.

The diagram shows four electrical circuit symbols.

Four electrical circuit symbols labeled A, B, C, and D. Symbol A is a thermistor, represented by a rectangular box with a diagonal line through it that has a flat horizontal section at the lower-left end. Symbol B is a variable resistor, represented by a rectangular box with a diagonal arrow pointing upwards and to the right through it. Symbol C is a light-emitting diode (LED), represented by a triangle pointing to a vertical line with two small parallel arrows pointing outwards and away from the top-right of the symbol. Symbol D is a light dependent resistor (LDR), represented by a rectangular box with two small parallel arrows pointing downwards and towards the top-left of the box.

Which symbol represents a thermistor?

  • A
  • B
  • C
  • D
[1]
b.

Which symbol represents a light-emitting diode (LED)?

  • A
  • B
  • C
  • D
[1]
c.

An electric kettle connected to the mains supply has a power rating of 1500 W.

State the equation linking power, current, and voltage.

[1]
d.

Show that the current in the electric kettle is approximately 6.5 A when connected to a 230 V mains supply.

[3]
e.

Which of these fuses should be used with the electric kettle?

  • A: 3 A
  • B: 5 A
  • C: 10 A
  • D: 13 A
[1]
f.

Explain how the fuse protects the electric kettle when the current in the kettle is too high.

[3]

Mains electricity Questions

  1. IGCSE
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  3. /Mains electricity