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There is a rated voltage of 220 V, power 100 W incandescent lamp, 5 hours a day, 30 days how much electricity?
15 degrees
When a 220 V 100 W electric lamp works, calculate (1) the electric energy of 1 kwh can supply the lamp to work for several hours (2) the actual power of the lamp when the voltage is 200 v
1、t=W/P=1kwh/0.1kw=10h
2. The resistance of lamp r = u & # 178 / P = (220 V) & # 178 / 100 W = 484 Ω
P real = u real I real = u real & # 178 / r = (200V) & # 178 / 484 Ω = 82.6w
The furnace wire marked with 220v1000w is folded and connected to the circuit of 220V. The actual power of the circuit is
A、250W B、500W C、2000W D、4000W
After folding, the length is reduced by half, and the cross-sectional area is doubled, so the resistance becomes 1 / 4 of the original. Therefore, according to P = u * 2 / R, under the condition of constant voltage, the electric power becomes 4 times of the original, so D
When a 220 V, 60 W incandescent lamp is connected to a 110 V circuit, its actual power should be
First, calculate the resistance of the lamp r = u divided by P = 48400 / 60
Then the power formula P = u divided by r = 12100 / (48400 / 60) = 15
So the actual power is 15W
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