Question

Name the factors on which the heat produced in a wire depends when current is passed in it and state how does it depend on the factors stated by you.

Answer 1

When current is passed in a wire, the heat produced in it depends on the following three factors:

• Current in the wire: The amount of heat H produced in the wire is directly proportional to the square of current I passing through the wire, i.e., H ∝ I².
• Resistance of the wire: The amount of heat H produced in the wire is directly proportional to the resistance R of the wire, i.e., H ∝ R.
• Time: The amount of heat H produced in the wire is directly proportional to the time t for which current is passed in the wire, i.e., H ∝ t.