Question

The working of electric fuse is based on:

• A. Ohm’s law
• B. Joule’s law of heating
• C. Coulomb’s law
• D. Faraday’s law

Answer 1

The correct option is B Joule’s law of heating

The working principle of a fuse is nothing but heating effect of electric current, also known as Joule's law of heating. According to Joule's law of heating when current 'I' flows through a conductor of resistance R, heat is produced. The heat produced (H) depends directly on the square of the current, resistance and time t for which the current is allowed to pass.
${\text{H = I}}^2\text{Rt}$.