We all use several electrical appliances in our home without knowing how much electricity it will consume. But now you can calculate yourself the daily or monthly consumption of your electrical appliances and also can save energy by suitably switching off them when not in use.
(Wattage x Hours used per day) ÷ 1000 = Daily Kilowatt Hour (kWh)
1 kWh = 1 unit of consumption
Suppose a 20 watt CFL bulb is kept on for 8 hours in a day. Then the daily consumption in terms of units will be calculated as
(20 x 8) ÷ 1000 = 0.16 kWh = 0.16 unit
Similarly if a Ceiling fan is switched on for 12 hours then its daily consumption will be as follows
(75 x 12) ÷ 1000 = 0.9 kWh = 0.9 unit