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what is the resistance of a circuit that contains a 12 volt battery and two 3-ohm bulbs in a series

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AL2006
Two 3-ohm resistances in series have 6 ohms of resistance. The battery makes no difference. They don't even have to be in a circuit at all ... the two resistors could be in a box on the shelf. If they're connected in series, then they make 6 ohms.