Q. 53.6( 25 Votes )
In previous class yo
Due to the heating effect of current, the filament of the bulb gets heated to such a high temperature that it starts glowing. However, if the current through a circuit is too small, the filament of the bulb does not get heated to a high temperature and it does not glow. The reason why is the current in the circuit small is that though a material may conduct electricity, it may not conduct it as easily as a metal. As a result, though the circuit of the tester becomes complete and the current flows through it, the current is too small.
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