Question

On giving 220V to a resistor the power dissipated is 40W then value of resistance is

• A. 1210 Ω
• B. 2000 Ω
• C. 1000 Ω
• D. None of these

Answer 1

Answer: (A)

1210 Ω

Answer 2

$P = \frac{V^{2}}{R} \Rightarrow R = \frac{V^{2}}{P} = \frac{(220)^{2}}{40} = 1210\Omega$