Question

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

Answer 1

Step 1: Given data

Power of each device, $\mathrm{P}=500W$

Total time, $\mathrm{t}=10\mathrm{hours}$

Step 2: Calculate the energy consumed

The total power of the four devices is calculated below:

$\mathrm{Total}\mathrm{power}=\left(500\times 4\right)W=2000W=2kW\left[1kW=1000W\right]$

The energy $\mathrm{E}$ consumed is calculated below:

$$\begin{gathered} \mathrm{E}=\mathrm{P}\times \mathrm{t} \\ \mathrm{E}=2kW\times 10\mathrm{h} \\ \mathrm{E}=20kWh \end{gathered}$$

Hence, the energy consumed is $20kWh$.