Questions: 1. What may happen if you add another bulb to both of your setups? Why? 2. What may happen if the filament of one of the bulbs in your r first setup melts? Why? 3. What may happen if the filament of one of the bulbs in your second setup melts? Why?
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Explanation:
1.When you plug in that second bulb, both will get equally dim, because you have added more resistance to your circuit, which decreases the flow of current.
2.On melting of filament in the bulb, the circuit will break and hence will not be able to conduct electricity. Thus, the rest connected bulbs will not glow.
3.On melting of filament in the bulb, the circuit will break and hence will not be able to conduct electricity. Thus, the rest connected bulbs will not glow. Filament of bulbs are made of an alloy having high melting point, so that it remains undamaged on increase in temperature.