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प्रश्न
What is meant by the heating effect of current? Give two applications of the heating effect of current.
उत्तर
When an electric current is passed through a high resistance wire, like nichrome wire, the resistance wire becomes very hot and produces heat. This is called the heating effect of current.
The heating effect of current is used in electric irons, electric heaters, electric ovens, filament bulbs etc. and it is also utilised in electric fuses.
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संबंधित प्रश्न
Write Joule's law of heating.
Derive the expression for the heat produced due to a current 'I' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is this relation known?
Name the material which is used for making the filaments of an electric bulb.
An electric fuse works on the:
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current
Which electric heating device in your home do you think have resistors which control the flow of electricity?
Give a scientific reason.
For electric power transmission, copper or aluminium wire is used.
How can overloading be avoided?
An electric iron draws a current of 4 A when connected to 220 V mains. Its resistance must be:
Assertion: Bending of wire decreases the resistance of the electric wire.
Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.
______ wire is used in the filament of the bulbs.
