Tags: #electrics #cost #money #calculate #home
Look at a recent bill for the cost of 1 kilowatt-hour.
e.g. 13p
There are 1000 watts in a kilowatt.
To calculate kilowatt of an appliance: watt / kilowatt.
e.g. 40 watt fan = 40 รท 1000 = 0.04
If the appliance doesn’t include watts, you can multiply the volts by the amps to get watts.
Now multiply that value by 13 (the cost of a kwh)
e.g. 0.04 x 13 = 0.52p an hour (that’s half a penny).
Multiply that value by the number of hours you expect the appliance to run.
e.g. 8 hours means 0.52 x 8 = 4.16
This means: running the appliance for 8hrs will cost you just over 4 pence.