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Mains electricity

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Question 25

The table shows information about three electrical appliances.

AppliancePower in WCurrent in A
Smart speaker150.065
Induction hob345015
Workstation PC805
a.

State the relationship between power, current, and voltage.

[1]
b.

Calculate the current in the workstation PC. [assume that the mains voltage is 230 V]

[2]
c.

The diagram shows the different cables used for the induction hob (Cable A) and the smart speaker (Cable B).

Two electrical cables. Cable A is a thick three-core cable with wires labeled L, N, and E. Cable B is a thin two-core cable with unlabeled wires.

Suggest why the copper wires in Cable A are thicker than the copper wires in Cable B.

[2]
d.

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

[1]
e.

Suggest why the smart speaker is safe to use, even though Cable B only has two wires.

[1]
f.

The smart speaker is left switched on for 8 hours. Calculate the energy transferred by the smart speaker in this time.

[3]

Mains electricity Questions

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