Question

An electrical appliance is rated $1500W-250V.$ This appliance is connected to $250V$ mains. Calculate

The cost of electrical energy consumed at$₹2.5perkW-h.$

Answer 1

Step 1: Given data

Power input $P=1500W$

Voltage difference $V=250V$

Rate per unit $r=₹2.5perkW-h$

time $t=60hours$

Step 2: To find out the energy consumed

The formula for the current in the circuit is $H=P\times t$

$$\begin{gathered} \Rightarrow H=P\times t \\ \Rightarrow H=\left(1500\right)\times 60W-h. \\ \Rightarrow H=\frac{\left(1500\right)\times 60}{1000}=90kW-h. \end{gathered}$$

Thus, the energy consumed$60hours$is $90kW-h.$

Step 3: To find out the cost of electrical energy consumed

The formula for the cost will be $=r\times H$

$$\begin{gathered} \Rightarrow \cos t=r\times H \\ \Rightarrow \cos t=₹2.5\times 90 \\ \Rightarrow \cos t=₹225 \end{gathered}$$

Thus, The cost of electrical energy consumed at$₹2.5perkW-h$ is$₹225$.