What is Joule's heating effect? How can it be demonstrated experimentally? List its four applications in daily life.

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Solution

According to Joule's law of heating, if heat $H$ is being produced in a wire then

$H \propto I^{2}$
$H \propto R$
$H \propto t$
where $I$ is current in wire $R$ is resistance of wire and $t$ is the for which current flows.
Combining all factors
Heat produced in a wire is given by $H = I^{2} R t$ in Joule
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.

(4)The heating effect of electric current is utilised in laundry iron.

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What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.

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