Three bulbs rated 100W,50W and 200W are connected in parallel across 220V.Find the total resistance.
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hello I cud nt find the perfect ans.. but I have found a similar example which wud make u easy to ans the one
Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is
We know that, R = V2 /P
Hence resistance of 1st bulb = (250)2 / 200 = 625/2
resistance of 2nd bulb = (250)2 / 100 = 625
Total resistance of the circuit when the bulbs are connceted in series = 625/2 + 625 = 1875/2 ohm
Therefore, total power consumed in the circuit , P = (250)2 / (1875/2) = 67 watt
Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is
We know that, R = V2 /P
Hence resistance of 1st bulb = (250)2 / 200 = 625/2
resistance of 2nd bulb = (250)2 / 100 = 625
Total resistance of the circuit when the bulbs are connceted in series = 625/2 + 625 = 1875/2 ohm
Therefore, total power consumed in the circuit , P = (250)2 / (1875/2) = 67 watt
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