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1. Define electric power. What is its SI unit?

2. Two bulbs of 50 W, 220 V and 100 W, 220 V are given. How will you connect the bulbs so that 50 W, 220 V bulb will glow brighter than 100 W, 220 V bulb.

3. When the bulb 50 W, 220 V is connected to an 110 V supply calculate the power generated.

1 Answer

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1. The energy dissipated per unit time is the power.

P = \(\frac{ΔW}{Δt}\)

P = IV =I2R = \(\frac{V^2}{R}\)

Unit is watt.

2. In series

R = \(\frac{V^2}{P}=\frac{220}{50}\) = 96852

3. Power, P = \(\frac{V^2}{R}=\frac{110^2}{968}\) = 12.5 w

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