( 7. Give reason:
a. The two terminals of a cell should not touch each other.
b. A fused bulb does not light up.
c. Air is an insulator.
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The two terminals of a cell should not touch each
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- CAUTION : Never join the two terminals of the electric cell without connecting them through a switch and a device like a bulb. If you do so, the chemicals in the electric cell get used up very fast and the cell stops working. Thus, both the electric cell and the bulb have two terminal each
- Sometimes an electric bulb does not glow even if it is connected to the cell. ... A break in the filament of an electric bulb means a break in the path of the current between the terminals of the electric cell. Therefore, a fused bulb does not light up as no current passes through its filament.
- Air is a good insulator because it is a gaseous substance, therefore its spread-out molecular configure resists heat transfer to some degree. ... This small space of air between the two layers of glass reduces the ability of heat transfer via convection.
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