Question

Find the energy in $kWh$ consumed in $10$ hours by four devices of power $500W$ each.

Answer 1

Step 1: Given Data,

Given parameters

Power rating of the device $\left(P\right)=500W=0.50kW$

Time for which the device runs $\left(T\right)=10h$

Step 2: Energy consumed by one device,

Energy consumed by an electric device can be obtained using the expression for power,
$P=\frac{W}{T}$

Work done $W=$ energy consumed by the device

$\therefore$Energy consumed $=P\times T$

$=0.50\times 10$

$=5kWh$

Step 3: Energy consumed by four devices,

Hence, the energy consumed by four equal rating devices in $10h$ will be

$\Rightarrow 4\times 5kWh=20kWh$

Hence, the required energy consumption is $20kWh$.