Question: how much electricity does a microwave use in a month?
Answer: There are 24 hours in a day and 30 days in an average month, giving us 720 hours. Multiply that by the 0.00308 kilowatts her microwave is using and you get 2.22 kilowatt-hours per month. At a rate of $0.11 per kilowatt hour, the microwave is eating about $0.24 per month sitting there on standby mode.