Incandescent bulbs are designed by keeping in mind that the resistance

1.	Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100 W, 60 W, and 40 W bulbs have filament resistances R100 , R60 and R40 , respectively, the relation between these resistances is(a) 1/R100 = 1/R40 + 1/R60(b) R100 = R40 + R60(c) R100 > R60 > R40(d) 1/R100 > 1/R60 > 1R40
Answer» Correct Answer is: (d) 1/R₁₀₀ > 1/R₆₀ > 1R₄₀ Power P = V²/R 1/R₁₀₀ = 1/R₆₀ + 1/R₄₀ As resistance increases with temperature, the equality does not hold exactly. Hence,1/R₁₀₀ > 1/R₆₀ > 1/R₄₀ is the best option.

Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100 W, 60 W, and 40 W bulbs have filament resistances R100 , R60 and R40 , respectively, the relation between these resistances is(a) 1/R100 = 1/R40 + 1/R60(b) R100 = R40 + R60(c) R100 > R60 > R40(d) 1/R100 > 1/R60 > 1R40

Answer»

Correct Answer is: (d) 1/R₁₀₀ > 1/R₆₀ > 1R₄₀

Power P = V²/R 1/R₁₀₀ = 1/R₆₀ + 1/R₄₀

As resistance increases with temperature, the equality does not hold exactly. Hence,1/R₁₀₀ > 1/R₆₀ > 1/R₄₀ is the best option.

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