physics class 7 answer please for these questions
Answers
1 - fuse wire that is used in bulbs has very low melting point so whenever there are chances of short circuit , the wire melts and breaks the circuit . Thus , preventing fire
2 - A MCB or circuit breaker is used in place of fuse because Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.
5 - effects of electric current are heating effects and magnetic effects .
heating effect is conversion of some of the electrical energy into heat energy.
magnetic effect is that a magnetic field is formed around a conductor when current flows through it which means it acts like a magnet.
6 - LED or light emitting diode is different and better from a bulb because it consumes less energy and allows comparatively less light energy to heat energy and Thus produces more light
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