if a[n electrical company charges 50 cents per kilowatt hour, how much will it cost to leave on a TV that has a rating of 350watts for 6 hours.
First multiply the wattage of the device times the hours it was in use. So we have:
350 x 6 = 2100
Divide this by 1000 = 2.1
This is the number of kilowatt hrs. used
Multiply this by .50 per kWh and we get
$1.05
+8 
