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The 220V 60W incandescent lamp can work normally on the 110V power supply
It doesn't work properly
Only in the 220 V power supply, can work normally
A certain incandescent lamp is marked with "220 V 40 W". If it is connected to both ends of 110 V power supply, 1. The actual power consumption is 2. At this time, the rated power of the lamp is
1.P=U*U/R
R = u * U / P = 220 * 220 / 40 = 1210
When u = 110V
P=U*U/R=110*110/1210=10W
2. Rated power refers to the power under standard voltage, that is, the power of 220 V, so it is 40 W
Can a 220 V, 15 W incandescent lamp and a 220 V, 40 W incandescent lamp be connected to a 380 V power supply in series
Can a 220 V, 15 W incandescent lamp and a 220 V, 40 W incandescent lamp be connected to a 380 V power supply in series? Explain the reason
The total power is 55W, so the series current I = P / u = 0.144
If calculated separately, the first current is 0.068, the second is 0.181, and the total is greater than 0.144
Two incandescent lamps with rated voltage of 220 V, power of 60 W and 100 W are connected in series with 220 V power supply. Who is the brightest and why?
First, find the resistance ratio of incandescent lamp r = u & # / W
R1/R2=W2/W1=5/3
Second, the voltage distribution of series circuit is proportional to the resistance surface
W=I²R
The actual power W is proportional to R
W1/W2=R1/R2=5/3
W1 is greater than W2
That is, the 60W bulb is brighter
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