alleryA resistor of 22 Ω is connected across a 220 V supply. What is the electrical power dissipated in it?
A2200 W
B10 W
C4400 W
D1100 W
Answer & Solution
Correct answer: A. 2200 W
1. Power in terms of voltage and resistance: $P = \dfrac{V^2}{R}$.
2. Substitute $V = 220$ V, $R = 22\ \Omega$: $P = \dfrac{(220)^2}{22} = \dfrac{48400}{22}$.
3. $P = 2200$ W.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.59_
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