Two bulbs are marked 6ow,220v and 60w,110v respectively.Find the ratio of their resistanve
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P = V^2/R
R₁= V/P
R₁= V'₁ /P
R₁/R₂ = V/V'
R₁/R₂ = 220×220/110×110
R₁/R₂ = 4/1
R₁ : R₂ = 4:1
R₁= V/P
R₁= V'₁ /P
R₁/R₂ = V/V'
R₁/R₂ = 220×220/110×110
R₁/R₂ = 4/1
R₁ : R₂ = 4:1
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