Question

What is joule's heating effect? How can it be demonstrated experimentally? List its four application in daily life?

Answer 1

According to Joule's law of heating, the heat produced in a wire is directly proportional to (1) Square of current (I^) (2) Resistance of wire (R) (3) Time (t), for which current is passed. i.e., Heat producted, H = I^2 X t Joules. Applications 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.