Advertisements
Advertisements
प्रश्न
What is an ‘electric fuse’? State its two characteristics of electric fuse.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
State the characteristics required in a material to be used as an effective fuse wire.
For a fuse, higher the current rating ________ is the fuse wire.
Why is the fuse wire fitted in a porcelain casing?
The rating of a fuse connected in the lighting circuit is ______.
Why fuse wire must always be connected in ‘live’ wire? Explain.
Where are the cartridge type fuse used?
Identify the option that displays the correct wiring with correct colour code:
Two fuse wires are rated 5 A and 20 A. Which of the two is longer ?
