Question

On which effect of current does an electric fuse work?
(A) magnetic effect
(B) chemical effect
(C) heating effect
(D) lighting effect

Answer 1

Hint: The electric fuse is the device that is used to protect the electric circuit from the damage due to the high current. When the short circuit current passes the fuse, it melts and causes the interruption in the current flow to protect the other circuit elements.

Complete answer:
The fuse is the element that is made from the substances of low melting point. When the maximum current flows through the fuse element, the heat generated from the current causes the fuse to melt. This is due to its nature of the low melting point. Since it melts, the connection between the circuit is lost. This is due to the heating effect of the electric current. It means the current flowing through the resistance conductor produces the heat. The use of the fuse is to save the other components of the circuit from the serious damage due to the high current. If the fuse is not used, the high current flows through the components of the circuit like capacitor, resistor etc. and causes serious damage to it by the fire. This also results in the financial losses. It is usually made of the alloy of tin and the lead. It usually consists of the $62\% $ tin and the $32\% $ lead.

Thus the option (C) is correct.

Note:
The heating effect of electric current is used in many practical uses. It includes the hair dryer, electric iron, electric kettle, electric heater, electric room heater, electric bulb etc. In these applications, more resistant material is used for the purpose of producing electric heat.