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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
To which wire should the fuse be connected?
State the characteristics required in a material to be used as an effective fuse wire.
What is a fuse?
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 ______.
How is a fuse put in an electric circuit?
‘A fuse is rated 8 A’. can it be used with an electrical appliance of rating 5kW, 200V?
Why fuse wire must always be connected in ‘live’ wire? Explain.
Where are the cartridge type fuse used?
What is the rating of fuse used in light and fan circuits?
(a) Name the electrical appliance shown in the diagram below.
(b) Name the material of the wire used in this device.
(c) Name two important characteristics of this wire.
