Question

What is Joules law of heating?

How can it be demonstrated experimentally?

List it's applications in daily life.(atleast 3)

Answer 1

Answer:

1) Joule heating, also known as resistive, resistance, or Ohmic heating, is the process by which the passage of an electric current through a conductor produces heat.

2) It can be demonstrated experimentally by following: When an electric field is applied across the ends of a conductor, the free electrons starts moving towards the electric field. ... Due to Joule heating, the fuse melts to break the electric circuit.

3) 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.

Explanation:

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Answer 2

Required Answer :

Joules law of heating: When an electric current is passed through a high resistance metallic wire, like nichrome wire, the resistance wire becomes very hot and produces heat. This effect is known as heating effect of electric current or Joules law of heating.

Joules law of heating states that the heat H which is produced in a conductor of resistance R due to current I flowing through it for time t is H=I²Rt.

A simple experiment to demonstrate heating effect of current is that if we switch on the bulb for a long time then it will become hot. This shows that when electric current flows through a metallic conductor, heat is produced in it.

Applications of Joule's law of heating are :

• Electric fuse, which is a safety device used in electrical circuit, works on this principle. Electric fuse in the circuit melts when a large current flows through the circuit and break down the circuit. It helps in short circuiting of appliances connected in circuit.

• Electric iron, electric heater, and geysers etc. works on this principle of heating effect.

• Electric bulb glows when electric current flows through the filament of the bulb. It also works on this principle.