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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
What is the difference between KVA and kW?
KW is active power
Kilowatt (kw) = kilovolt ampere (kVA) times power factor
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
There are 60 watt incandescent lamps and 20 Watt energy-saving lamps in a lamp shop. Their unit price is 2 yuan and 30 yuan. It is understood that the lighting effect and service life of these two lamps are the same. The local electricity price is 0.5 yuan per kilowatt hour. When the use effect of the two lamps is the same, how long is the service life of the two lamps?
Is the service life of the two lamps y hours?
According to the meaning: 0.06 * y * 0.5 + 2 = 0.02 * y * 0.5 + 30
So: y = 1400 hours
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