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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
Explain the meaning of the student 'current rating of a fuse is 5A'.
‘A fuse is rated 8 A’. can it be used with an electrical appliance of rating 5kW, 200V?
Higher the current rating, _______ is the fuse wire.
How does the thickness of a fuse wire depend on its current rating?
Why fuse wire must always be connected in ‘live’ wire? Explain.
Explain the significance of kWh meter, main switch and main fuse in house-circuiting.
Identify the option that displays the correct wiring with correct colour code:
Why is it not advisable to use a piece of copper wire as fuse wire in an electric circuit?
