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प्रश्न
What is an ‘electric fuse’? State its two characteristics of electric fuse.
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.
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संबंधित प्रश्न
A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.
A fuse is connected in ______ with the ______ wire.
(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 ?
Higher the current rating, _______ is the fuse wire.
Why fuse wire must always be connected in ‘live’ wire? Explain.
(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.
Identify the option that displays the correct wiring with correct colour code:
Name the material of fuse. State one characteristic of the material used for fuse.
'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V?
Why is it not advisable to use a piece of copper wire as fuse wire in an electric circuit?
