Question

What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.NCERT Class XScience - Exemplar ProblemsChapter_Electricity

Answer 1

The heating effect of current is defined by Joules law of heating. It 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 effect 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. Joule's heating effect.

According to Joule's law of heating, the heat produced in a wire is directly proportional to

(1) Square of current (I2)

(2) Resistance of wire (R)

(3) Time (t), for which current is passed. i.e., Heat producted, H = I2 R t Joules. Applications of Joule's heating effect in daily life :

(1) The heating effect of current is utilised in the working of electric heating appliances such as electric iron, electric kettle, electric toaster, electric oven, room heaters, geysers, etc.

(2) The heating effect of electric current is utilised in electric bulbs.

(3) The heating effect of electric current is utilised in electric fuse for protecting household wiring and electrical appliances.

Answer 2

Answer:

Joule’s heating effect and its four applications in daily life.

Explanation:

According to Joule's law of heating, if heat $\mathrm{H}$ exists being made in a wire then,

$\mathrm{H} \propto \mathrm{I}^{2}$

$\mathrm{H} \propto \mathrm{R}$

$\mathrm{H} \propto \mathrm{t}$

where $\mathrm{I}$exists current in wire $\mathrm{R}$ exists the resistance of the wire and $t$exists the for which current flows.

Connecting all aspects

The heat created in a wire exists given by $\mathrm{H}=\mathrm{I}^{2} \mathrm{R} t$ Joule

Applications of Joule's heating effect in daily life:

(1) The heating effect of current exists used in the working of electric heating devices such as electric iron, electric kettle, electric toaster, electric cooker, room heaters, geysers, etc.

(2) The heating effect of electric current exists used in electric bulbs.

(3) The heating effect of electric current exists used in electric fuse for saving household wiring and electrical devices.

(4)The heating effect of electric current exists used in laundry iron.

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