Domestic electrical installation

Question 1 of 10

The consumer unit (distribution board) contains

A. circuit breakers or fuses for each circuit B. the meter only C. the water pipes D. the TV

Question 2 of 10

An RCD (residual current device) protects against

A. electric shock from earth leakage B. high bills C. low voltage D. power cuts

Question 3 of 10

Electrical appliances with metal cases are earthed so that

A. they look better B. they use less power C. a fault current flows safely to earth and blows the fuse D. they work faster

Question 4 of 10

A residual current device typically trips at an earth leakage of

A. 30 mA B. 30 A C. 3 A D. 300 A

Question 5 of 10

A ring main circuit in a house is used for

A. socket outlets B. lighting only C. the doorbell D. the water heater only

Question 6 of 10

A miniature circuit breaker (MCB) is preferred to a rewirable fuse because it

A. uses more copper B. never trips C. can be reset after tripping D. is decorative

Question 7 of 10

The energy meter in a house measures

A. electricity consumed in kWh B. voltage only C. water usage D. gas pressure

Question 8 of 10

A 3 kW water heater on 230 V needs a cable rated for at least

A. 13 A B. 5 A C. 30 A D. 1 A

Question 9 of 10

Two-way switching is used, for example, to

A. charge two batteries B. run two appliances on one plug C. double the voltage D. control a staircase light from both the top and the bottom

Question 10 of 10

A residual current device (RCD) protects people by

A. raising the voltage B. cutting the supply when current leaks to earth C. storing charge D. cooling the cables

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New set of questions

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.

Past questions, worked solutions and curriculum-mapped study material for JHS and SHS students and teachers in Ghana.

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