First slide

Electrical power

Question

Let H₁ be the heat generated per second in the filament of 100 W, 250 V lamp and H, be that in filament of 200 W, 250 V lamp. Which of the following is correct ?

Easy

A

H₁= 2H₂
B

H₁ = 4H₂
C

2H₁ = H₂
D

4H₁ = H₂

Solution

The resistance of 200 W lamp is half that of 100 W lamp. So, heat produced in 200 W lamp is twice that produced in 100 W lamp
$∴ 2 H_{1} = H_{2}$

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