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प्रश्न
What is an ‘electric fuse’? State its two characteristics of electric fuse.
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उत्तर
The electric fuse is a safety device in electric circuits, used to limit the current and thus it acts as a safeguard for the household circuit and any electric appliance connected in the circuit from being damaged. Its characteristics are:
(i) It has a low melting point (m.p.) of about 200°C and is usually made from an alloy of 50% tin and 50% lead.
(ii) It has a high resistance so that its temperature rises rapidly and soon exceeds its m.p. and thus breaks it, when current passing through it exceeds the permissible limits. In such a case it acts as a switch.
संबंधित प्रश्न
For a fuse, higher the current rating ______ is the fuse wire.
Explain the meaning of the statement ‘the current rating of a fuse is 5 A’.
(i) Write one advantage of connecting electrical appliances in parallel combination.
(ii) What characteristics should a fuse wire have ?
(iii) Which wire in a power circuit is connected to the metallic body of the appliance ?
How does the thickness of a fuse wire depend on its current rating?
Why fuse wire must always be connected in ‘live’ wire? Explain.
What is the rating of fuse used in light and fan circuits?
What is the rating of fuse used in power circuits, in domestic use?
Explain the significance of kWh meter, main switch and main fuse in house-circuiting.
Name the material of fuse. State one characteristic of the material used for fuse.
