Question #5c599

1 Answer
Mar 11, 2017

Energy is power x time, or #E=pxxt#

Explanation:

To get the energy in kWh, we need to express the power in kW:

#p=4xx100W=400W=0.4kW# (remember #1kW=1000W#)

If all this is used for 10 hours a day, and september has 30 days, then the time factor is:

#t=10hxx30=300h#

Putting these together we get:

#E=pxxt=0.4kWxx300h=120kWh#