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Physics for Secondary Schools
To the next junction box Checking electrical faults in
domestic appliances
From previous Identifying electrical faults in
junction box domestic appliances is essential
for ensuring safety and optimal
Junction box Ceilling
FOR ONLINE READING ONLY
rose performance. Common issues like
short circuits and faulty wiring
Wall switch To light fitting can lead to malfunctions and pose
hazards, making regular inspections
Figure 2.51: Junction box lighting circuit
and maintenance crucial. Two
devices are useful when checking
Task 2.4 electrical appliance faults. These
1. Open up a three-pin plug and fix it to a are the multimeter and the live
cable and a fuse. Ask the teacher to check mains lead indicator. Multimeters
before you close it up. are tools used for measuring a
2. Open the two-pin plug and fix it to the variety of electrical variables. The
cables as instructed. Ask the teacher to most basic parameters measured are
check before you close it up. voltage and current (both a.c and
d.c.). They also have a range switch
so that precise readings can be
Project 2.1 taken. There are moving coils and
digital multimeters. The moving-
coil multimeters (analogue) (Figure
Aim: To demonstrate a ring and tree
wiring on an electrical board 2.52 (a)) have some disadvantages
as they involve various settings
Materials: two switches, wire cutters, when in use. The digital multimeter
electrical board, bulb, red or (Figure 2.52 (b)), has no moving
brown, black or blue and yellow
or green cables, each about 2 parts, thus, easy to use.
metres long
Procedure
1. Draw a schematic diagram of a ring in the
circuit on a sheet of paper. Use the diagram
to connect the circuit to the electrical board.
Ask your teacher to check your connections
before dismantling.
2. Draw a loop-in circuit to carry lamps. Use
the diagram to connect the circuit to the
electrical board. Ask your teacher to check (a) Analogue (b) Digital
your connection before dismantling it. Figure 2.52: Multimeters
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Student’s Book Form One
Physics Form 2 Final.indd 78 25/10/2025 10:26
