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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'.
Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.
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 ______.
A fuse is connected in ______ with the ______ wire.
Why is the fuse wire fitted in a porcelain casing?
Higher the current rating, _______ is the fuse wire.
Explain the significance of kWh meter, main switch and main fuse in house-circuiting.
State the purpose of using a fuse in a circuit.
Two fuse wires are rated 5 A and 20 A. Which of the two is longer ?
Why is it not advisable to use a piece of copper wire as fuse wire in an electric circuit?
