There is software that you can use to view the usage on a computer. You can look very deep into your electrical usage down to what you were using in hourly increments.
This was when I was monitoring my Geospring heat pump hot water heater. You can see it run in the morning and then again later in the evening. The peak wattage being .53kwh. It draws about 500 watts in heat pump mode. Cost me .40 cents to run that day.
