If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio

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If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio of their resistances will be

Options

(a) (3:2)
(b) (2:3)
(c) (3:4)
(d) (4:3)

Correct Answer:

(3:2)

Explanation:

P = V² / R

⇒ R₁ / R₂ = P₂ / P₁ = 60 / 40 = 3 / 2 = 3 : 2

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Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)

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