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- Distinguish between the terms 'overloading' and 'short-circuiting as used in domestic circuits.
- Why are the coils of electric toasters made of an alloy rather than a pure metal?
(a) Overloading- An extremely large amount of current is withdrawn from the circuit when too many electrical appliances of high power-rating are switched on at the same time or connected in a single socket. This situation is known as overloading.
Image is posted for reference only
Short-circuiting- It occurs when the plastic insulation of live and neutral wires gets torn somehow and touches each other, then due to this direct touching (connection) of the two wires an electric short circuit occurs. In this case, the resistance of the circuit so formed is very small and therefore, the current flowing through the wires increases heavily.
Image is posted for reference only
(b) The coils of electric irons and electric toasters are made of alloys rather than pure metal because:-
1. the resistivity of an alloy is much higher than the pure metals.
2. an alloy doesn't undergo oxidation or burn easily even at high temperatures (when it is red hot).
Image is posted for reference only
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