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 | Hey, every bulb is out on these Christmas Tree lights! | |
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| I doubt that every light burned out at the same time. Maybe it's a series circuit? | |
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| What is a series circuit? | |
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| That is a circuit where each bulb has to burn or none of them will! | |
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| So we have to test each bulb to find the bad one? | |
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| Yes that's right! | |
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