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  1. K

    HELP! Light bulbs and circuits!

    May i ask why " P= V^2/R " was used to calculate the Resistance of the individual light bulbs? In doing so, the voltage in each case was taken constant. (120 V in second reply) How is this possible?. The voltage across the bulbs in series is not constant!!! If " P= (I^2)R " is used to calculate...