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When an electric lamp is connected to a 220 V power supply, its power is 100 W. if the power supply is connected to a long wire and then connected to the lamp, its power is 81 W, then the power consumed on the wire is 100 W______ W．
According to P = u2r, the resistance of electric lamp: r = u2p = (220V) 2100W = 484 Ω, when the power of bulb is 81w, the voltage at both ends: u = P = 81w × 484 Ω = 198v, ∵ the current in the series circuit is equal, ∵ the current in the circuit: I = u = r = 198v484 Ω = 922a, ∵ the total voltage in the series circuit is equal to the power distribution
Connect a 220 V 60W lamp A and a 220 V 40W lamp B in series on the 220 V power supply. Which lamp is brighter
Series voltage, resistance of the voltage. R = u ^ 2 / P
So, 40W light
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