50 watts of power an hour 0.05 electricity.
1 kilowatt of electricity is equal to 1 kilowatt, for example, a power of 1 kilowatt of electrical appliances, the continuous operation of an hour, then the power consumption of 1 kilowatt. According to the "kW-h" formula for conversion, the power consumed by a 1KW (1000W) power device running for one hour is "1 degree".
Then "50W" power equipment needs to run for 20 hours to consume one degree of electricity, with 1000W divided by 50W, the final conclusion, 50W power equipment running an hour to consume 0.05 degrees of electricity.
Degree and watt conversion formula is 1 degree = 1 kilowatt hour = 1 kilowatt × 1 hour = 1000 watts × 1 hour = 1000 watts × 3600 seconds. Kilowatt-hour is usually called "degree", is the unit of electric power, symbol: kW-h, the formula for power times time. Assuming that the power of a power-consuming equipment for 2500 watts, that is, its one-hour power consumption of 2.5 kilowatt-hours, that is, 2.5 degrees of electricity an hour.
Estimating kWh from equipment labels
1. Find the power of the equipment. Most high-power electrical equipment has a specification label on the back or bottom. If you look at this label, you will see a number with "w" written on the front. This number indicates the maximum power used by the equipment, which is usually higher than the actual average.
2. Multiply the number of hours the device is used in watts. The unit of watts indicates the amount of power or energy consumed by the device over a specified period of time. By multiplying the number of watts per unit of time, you can calculate the approximate amount of your electric bill.
3. Divide the result by 1,000. each kilowatt-hour equals 1,000 watts, which converts the response in watts to kilowatt-hours.
4. Multiply the answer by the number of days. You now know how many kilowatt-hours (kWh) of energy this fan consumes each day. To calculate how much power the device consumes in a month or a year, multiply the resulting kWh by the number of days required, such as a week, a month or a year.
5. Multiply the result by the cost of electricity consumed per kWh. Electricity is usually costed in kilowatt-hours; multiply this figure by kilowatt-hours to calculate your electricity bill.
Reference for the above: Baidu Encyclopedia-Watt