Question

Name two devices which work on the heating effect of electric current.

Answer 1

The devices which work on the heating effect of the electric current are those which produce heat when connected to an electric circuit. The flow of current through the coils of these devices produces heat energy which can be utilized for different applications.

Complete step by step answer:
When we allow current to pass through a conductor, it produces heat energy. The amount of heat energy produced by a current is given as
$H = {I^2}Rt$
Here I is the amount of the current flowing through the conductor while R represents the resistance offered by the conductor to the flow of current.
The devices which work on this property of heating effect are electric heater, electric iron, electric fuse, etc.
In an electric heater and an electric iron, we have coils of the conducting materials which has the property of producing heat when electric current is passed through them.
In case of an electric fuse, when the current flowing through the fuse wire exceeds a certain limit then the wire melts down due to excessive heating of the wire.
This is the required answer.

Additional information:
We can get the expression of power of the electric device from the amount of heat energy produced by the device. The power is equal to the rate at which the device does work or produces the heat energy. It is given as
$P = \dfrac{H}{t} = {I^2}R$

Note:
It should be noted that in the expression for the heat energy, the amount of heat energy depends on the square of the electric current passed through the conductor while there is linear dependence on the resistance of the conductor. This means that we will get greater heating when we vary the current through the conductor rather than resistance.