two bulbs have rating 100W, 220V and 60W, 220V respectively which one has a greater resistence?
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Answered by
204
(1) P1=100 W
V1 = 220 V
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P = V×I
P = V × (V/R)
P = V^2/R
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100 = (220×220)/R1
R1 = 484 ohm
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(2) P2 = 60 W
V2= 220 V
________________
60 = (220×220)/R2
R2 = 806.6 ohm
_______________
Hence R2 is greater than R1
V1 = 220 V
________________
P = V×I
P = V × (V/R)
P = V^2/R
________________
100 = (220×220)/R1
R1 = 484 ohm
________________
(2) P2 = 60 W
V2= 220 V
________________
60 = (220×220)/R2
R2 = 806.6 ohm
_______________
Hence R2 is greater than R1
Answered by
103
The second bulb should have greater resistance.
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