Answer:
The
heating effect of current is defined by Joules law of heating. It states that
the heat H produced by a resistor of resistance P, due to current flowing
through it for time? IsIt is also
called ohmic heating and resistive heating.
In a conductor when an electric field is applied across its ends, the
free electrons available in it start drifting opposite to the direction of the
electric field. These electrons collide with the atoms which have lost the
electrons.
As a result of these collisions some energy of the
electrons is transferred to the atoms which vibrate violently as they gain
energy. Thus, heat is developed in the conductor. Greater the current , greater
will be the rate of collision and so greater will be the heat produced.
The four applications using heating effect of current are
as follows
(i) room heater (ii) electric bulb (iii)
electric iron (iv) electric fuse
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