look at the power rating in the electrical device you used at home indicate the power usage and energy as it used for about 3 hours..
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To get specifics regarding your energy usage, you only need one tool, really: an electricity usage monitor that tells you exactly how many kWh a device or appliance is drawing. The monitor can be as simple as a "plug load" monitor that plugs into an outlet; then you plug the device/appliance into the monitor.
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