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For a series circuit... Each bulb has different impedance (ohms) resulting in a different voltage drop across each. Remember Kirchoff's Current Law: The current at each point in a series circuit is the same. That same current, multiplied by the different voltage drops results in different powers (watts = amps * volts) for each bulb. For a parallel circuit. Again, each bulb still has different impedance. This time, the voltage drop is the same (Kirchoff's Voltage Law) but the current in each bulb is different. Same situation - different power in each bulb.

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