MAINS ELECTRICITY

1 mark · Normal

State why the casing of a plug is made from plastic.

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Plastic is a good insulator and prevents electric shock.

Also accept: Because it is an insulator that prevents users from getting an electric shock; Prevents current from passing to the user

Common mistakes: Because it is cheap (incomplete reason)

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Marking points

B1 · 1 mark · Gives 'insulator' or 'prevents electric shock' as reason for plastic casing.

Worked solution

Plastic is used because it is a good insulator and helps prevent electric shocks.