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One degree of electricity can give a 50 Watt fluorescent lamp several hours
Twenty hours
A 200 Watt lamp is electrified every few hours
Degrees are units of energy, corresponding to joules, and watts are units of power
One degree is equal to one thousand watt hours, that is, one thousand watt per hour. That is to say, if there is a water heater with one kilowatt power, it consumes one degree of electric energy for one hour
Your light is 200W, which is 0.2 degree an hour. Multiply by 5, it is 1 degree electricity
So it's five hours
If the power ratio of a and B is 3:2 and the power consumption ratio is 4:3, the working time ratio is?
The relationship between the electric energy consumed by electrical appliances W, the electric power P of electrical appliances and the working time t is w = Pt
So W1 / P1 = T1
W2/P2=t2
Then T1 / T2 = (W1 / P1) / (W2 / P2) = (W1 / W2) * (P2 / P1) = (4 / 3) * (2 / 3) = 8 / 9
When the power ratio of a and B is 1:2 and the power on time ratio is 3:4, the power consumption ratio is ()
A. 1：2B. 3：8C. 3：4D. 2：3
The ratio of electric energy consumed by a and b electrical appliances is w a W B = p a t a P B T B = 12 × 34 = 38
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