Question

Calculate the electrical energy consumed when a current of' 4.5 ampere flows through a resistance of 4 ohms for 30 minutes.

Answer 1

Given, Current $I=4.5A$

Resistance $R=4\Omega$

Time $t=30minutes=\frac{30}{60}hrs$

We know that Power $P=I^{2}R={4.5}^2\times 4=81watt=0.081kW$

Energy consumed $=P\times t=0.081\times 0.5=0.0405kWh$