If R1 and R2 are the two resistances of filaments of a 400 W and a 200 W lamp, designed to operate on same voltage , then A) R1= 2R2
B) R2 = 2R1
C) R2 = 4R1
D) R1 = R2
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If R1 and R2 are the two resistances of filaments of a 400 W and a 200 W lamp, designed to operate on same voltage , then A) R1= 2R2
B) R2 = 2R1
C) R2 = 4R1
D) R1 = R2
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