Answer to Question #127779 in Electric Circuits for Naveen sharma

Question

no load voltage of power source is 220 volt.it provides power of 20 watt in a load.if current value is 0.4 ampere then maximum power supply of power source

Answer 1

Maximum power transfer theorem states that maximum power is delivered to a load when the load resistance is equal to the source resistance.

Therefore we calculate the load resistance using the formula;

$P=I^{2}R$

$20=0.4^{2}R$

R= 50 ohms

using the maximum power transfer formula

$\frac{V^2}{4\times R}$ ,

maximum power supplied by the source is

$\frac{220}{4\times50}=242$

Answer =242