Physics
Why is the fuse wire fitted in a porcelain casing?
Household Circuits
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Answer
The fuse wire is fitted in a porcelain casing because it is an insulator of electricity.
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Related Questions
Assertion (A): A domestic electrical appliance working on a three point socket will continue working even if the top pin is removed.
Reason (R): The third pin is used only as a safety device.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Complete the following sentences —
(a) A fuse is a short piece of wire of high ………. and of material low ………..
(b) A fuse wire is made of an alloy of ………. and ……….. If the current in a circuit exceeds the current rating of the fuse wire it ………..
(c) A fuse is connected in ………. with the ………. wire.
(d) Higher the current rating, ………. is the fuse wire.
(e) Live wire is also called ………. wire.
Two fuse wires are rated 5 A and 20 A. Which of the two is (i) thicker, (ii) longer?
(a) 'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V?
(b) Name two safety devices which are connected to the live wire of a household electric circuit.