(a) Draw the symbols to represent the following components of electrical circuits: cell, bulb, switch in the ‘ON’ position, switch in the ‘OFF’ position and battery.

(b) An electrician is doing some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response. [5 MARKS]

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Solution

(a) Diagram: 2 Marks
(b) Explanation: 3 Marks

(a)

(b) No, the electrician cannot be allowed to replace the fuse in the house by a piece of wire because every wire cannot be used as a fuse filament. A fuse filament must have a low melting point such that it could melt and break in response to a large amount of current. Most of the wires have high melting points.

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