Question

What is the Joule's heating effect? How can it be demonstrated experimentally? List its four applications in daily life.
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Answer 1

List its four applications in daily life. When an electric current is passed through a high resistance wire, like nichrome wire, the resistance wire becomes very hot and produces heat. This effect is known as heating effect of current or Joule's law of heating.

Answer 2

|$\large\mathrm\purple{Solution}$|

According to Joules heating effect heat produces in a resistor is

• Directly proportional to square of current for the given resistor.
• Directly proportional to resistance for a given current,
• Directly proportional to the time of current flowing through the resistor.

This can be expressed as:-

H = I²Rt

H is heating effect, I is electric current, R is resistance and t is time.