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| Hey you are right! I replaced one bulb and they all lit up. | |
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| Let's try another string! | |
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| Ok, this one only has one bulb not working. What's with that? | |
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| That string must be a parallel circuit. | |
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| What is a parallel circuit? | |
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| It's a circuit where each light does not depend on the other lights to burn. | |
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