Question

Which of the following is a correct statement?

• A. Heat produced in a conductor varies directly as the current flowing.
• B. Heat produced in a conductor varies inversely as the current flowing.
• C. Heat produced in a conductor varies directly as the square of the current flowing.
• D. Heat produced in a conductor varies inversely as the square of the current flowing.

Answer 1

Answer: (C)

According to Joule law of heating Heat produced in a conductor,
$H = I^2 R t$
where,
$I$ = Current flowing through the conductor
$R$ = Resistance of the. conductor
$t$ = Time. for which current flows through the conductor.
$ \therefore \, H \propto I^2$