1.

tow bulbs have rating 100w ,220v and60w,220v respectively which one has a greater resistance

Answer»

(1) P1=100 WV1 = 220 vP = V×IP = V × (V/R)P = V^2/R100 = (220×220)/R1R1 = 484 ohm(2) P2 = 60 WV2= 220 V60 = (220×220)/R2R2 = 806.6 ohmHence R2 is greater than R1



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