Energy = Power x Time

Given that each device has a power of 500 W and the time duration is 10 hours, let’s calculate the total energy consumed by all four devices:

Total power of four devices = 4 x 500 W = 2000 W

Time = 10 hours

Now, to find the energy consumed:

Energy = Total Power x Time
Energy = 2000 W x 10 h

Let’s calculate:

Energy = 20,000 Wh

To convert watt-hours (Wh) to kilowatt-hours (kWh), we divide by 1000:

Energy = (20,000 Wh)/(1000) = 20 kWh

Therefore, the total energy consumed by the four devices in 10 hours is 20 kilowatt-hours (kWh).