Ron and his father arranged a string of lights on their Christmas tree and switched them on. But they did not light up. His father checked all the connections at the plug. There did not seem to be any problem. He then started checking the bulbs one by one. What do you think may have happened?

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Solution

This problem may occur if any of the bulbs in the string of lights is fused. Here, all the bulbs are connected in series. If one bulb gets fused, the circuit will break and all bulbs will be turned off.

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figure

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