1. If current does not flow through a circuit, then it is said to be a/an __________________ circuit. 2. The working of electric fuse is based on ___________________ effect of electricity. 3. A compass needle only be deflected by a _______________ 4. __________________ effect of current gives us light in an electric bulb.
class 7
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Explanation:
Electric bulb is an electrical instrument which works on heating effect of electric current.
Explanation:
1. In an electric bulb, a filament of metal such as tungsten with melting point ( 3410 °C ) is used.
2. As soon as the electric current is passed through the filament, it becomes hot and emits light.
3. Along with the metal filament, there are also some gases in an electric bulb such as nitrogen and argon.
4. Due to presence of these gases, the oxidation of metal filament is avoided and thereby the bulb can be used for a longer time.
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