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Mains electricity

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Question 2

The table shows information about three electrical appliances.

AppliancePower in WCurrent in A
LED desk lamp120.052
Electric kettle300013
Game console138
a.

State the relationship between power, current, and voltage.

[1]
b.

Calculate the current in the game console. [assume that the mains voltage is 230 V]

[2]
c.

The diagram shows the different cables used for the electric kettle and the LED desk lamp.

Two electrical cables. On the left is the thick cable for the electric kettle, split at the end to show three wires labeled E (Earth), N (Neutral), and L (Live). On the right is the much thinner cable for the LED desk lamp, split at the end to show only two unlabeled wires.

Suggest why the wires in the electric kettle cable are thicker than the wires in the LED desk lamp cable.

[1]
d.

Which of the three wires (E, N, or L) is connected to the fuse?

[1]
e.

Suggest why the LED desk lamp is safe to use, even though its cable only has two wires.

[1]
f.

The LED desk lamp is switched on for 45 minutes. Calculate the energy transferred by the lamp in this time.

[3]

Mains electricity Questions

  1. IGCSE
  2. /Physics
  3. /Mains electricity