Energy consumption calculation
The energy E in kilowatt-hours (kWh) per day is equal to the power P in watts (W) times number of usage hours per day t divided by 1000 watts per kilowatt:
E(kWh/day) = P(W) × t(h/day) / 1000(W/kW)
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When you get your electricity bill each month, you may not think a whole lot about what goes into it. But in reality, every appliance or electronic device adds a little something to your bill. By figuring out what the biggest energy hogs are in your home, you can adjust your usage by unplugging or simply using the device less. Every change you make should help whittle down your energy expenses.