SSC JE Electrical Engineering 2010 Paper

Question : 5 of 50

Marks: +1, -0

The ratio of resistances of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be at respective voltages

Solution:

R_1= 220^2/100=V^2/W

, for 100W, 220V

R_2=110^2/100,

for 100W, 110V

R_1/R_2=(220/110)^2×100/100=4

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