two bulbs rate having the following ratings
40w;220v
20w;110v
what is the ratio of their resistance
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HENCE P=VI
I) 40 = 220 * I
I = 0.182 A
ll) 20 = 110 * I
I = 0.182 A
RATIO OF RESISTANCE IS R1/R2;
V=IR
R = V/I
R1/R2 = (V1/I1)/(V2/I2)
= ( V1*I2 ) / (V2*I1) = 220/110 = 2:1
I) 40 = 220 * I
I = 0.182 A
ll) 20 = 110 * I
I = 0.182 A
RATIO OF RESISTANCE IS R1/R2;
V=IR
R = V/I
R1/R2 = (V1/I1)/(V2/I2)
= ( V1*I2 ) / (V2*I1) = 220/110 = 2:1
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