What's the power consumption of one watt energy-saving bulb in one hour

What's the power consumption of one watt energy-saving bulb in one hour

One kilowatt hour is one degree (that is, one kilowatt bulb consumes one degree per hour), so one watt per hour consumes 0.001 degree (thousandth of a degree)

Power consumption per hour of 20 watt bulb
I want to know how much electricity a 20 watt bulb consumes per hour,

0.02 degree
(the power consumption of 1000 Watt electrical appliances is 1 degree per hour)

According to statistics, the power consumption of energy-saving lamps is 80% less than that of ordinary incandescent lamps. Yuying primary school uses 160 degrees of electricity for ordinary lamps every month. If the ordinary lamps are changed into energy-saving lamps, how much electricity is used for lighting every month?

160x80 / 100 = 1280 degrees

Xiao Wang's house is decorated. He goes to the store to buy light bulbs. At the counter of the store, there are 100 watt incandescent lamps and 40 Watt energy-saving lamps. Their unit prices are 2 yuan and 32 yuan respectively. It is known that the lighting effect and service life of these two kinds of lamps are the same. It is known that the electricity price of Xiao Wang's house is 0.5 yuan per kilowatt hour. When the service life of the two kinds of lamps exceeds how long, Xiao Wang will choose Energy saving lamp is cost effective? (electricity consumption (KWH) = power (kw) × time (H)

If the service life of these two kinds of lamps is more than 1000 hours, it is worthwhile for Xiao Wang to choose energy-saving lamps