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Remember the old Christmas lights that were a simple circuit. When you plugged the string in, hopefully, they would light up. If they didn't light up, you had to take a proven good bulb and screw it in to each light socket on the string until you found the faulty bulb.

With a string of lights wired into a parallel circuit, you or wouldn't have to do that. You could identify the faulty bulb right away because it would be the only one which did not light up.

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13y ago

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