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| Fuse |
1.15 Electric fuse
Fuse is a protective device which works on the heating effect of electric current. It is a wire made up of an alloy of lead and tin. This alloy has high resistance and low melting point. Fuse is kept in a ceramic box at the beginning of an electric circuit. (fig.)
Electric circuits are designed to carry electric current of a definite strength. If the strength of electric current crosses the safe level, the circuit and the instruments in the circuit may get damaged. In such situations the fuse-wire provides the neede protection. Fuse-wire melts and breaks the circuit as soon as the strength of electric current in the circuit crosses the safe level and thus prevents possible damage.
Electric bulb :
The bulbs that we use function on the basis of heating effect of electric current. A tungsten filament in the form of a coil is mounted on two copper leads in the bulb. When electric current is passed through the coil it heats up and emits light. Nitrogen is filled in the bulb to give it a long life.
The bulbs that we use function on the basis of heating effect of electric current. A tungsten filament in the form of a coil is mounted on two copper leads in the bulb. When electric current is passed through the coil it heats up and emits light. Nitrogen is filled in the bulb to give it a long life.
Activity :
Make a list of electrical gadgets used in your house. Find out the power of each of them.
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