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Household Electrification

Which of the ...

Question

Which of the following circuits will still be dangerous even if the fuse blows off and electric iron stops working during a short circuit?

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Solution

Circuit (b) will still be dangerous even if the fuse blows off and electric iron stops working during a short-circuit. This is because the live wire that carries A.C. power is still is in contact with the electric iron .

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Q. Which of the following observations for the electric circuit shown below are correct?

(i) Fuse 1 blows up before fuse 2, in case of excessive current.
(ii) Bulb C glows if bulb B gets fused.
(iii) Bulbs B and C glow if bulb A gets fused.

Question 2

Choose the statement which is not correct in the case of an electric fuse.

(a) Fuses are inserted in electric circuits of all buildings

(b) There is a maximum limit on the current which can safely flow through the electric circuits

(c) There is a minimum limit on the current which can safely flow in the electric circuits

(d) If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit

Q. ____ is a material which break off the electric circuit from the supply in case of a short circuit to protect the circuit.

State whether true or false.

When a short-circuit takes place, the fuse wire melts and breaks the electric circuit.

Q. A person connects too many electrical appliances to a single socket in his house. When all these electrical appliances connected to the single socket are switched on at the same time, the electric fuse of circuit blows off.
(a) What is the process of connecting too many electrical appliances to a single socket known as?
(b) Which effect of electric current is responsible for the blowing off of fuse wire?

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