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

Joule’s law of heating states that the heat produced in any resistor is
 
• Directly proportional to the passing through the resistor.
 
• Directly proportional to the of the resistor.
 
• Directly proportional to the for which the current is passing through the resistor.
 
The heating coil of an electric heater is made of wire. A spiral coil of the wire is put in a groove inside an . An insulator is used as it . Due to the , the wire becomes red hot when is passed through it. Thus, the heat produced by nichrome is utilised for cooking or heating.
 
Some of the applications in daily life are , , and .