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How to connect the 100W, 60W and 40W bulbs with the rated voltage of 110V in the circuit with the power supply voltage of 220V to make the bulbs light normally? Draw the circuit diagram and explain the reason with simple calculation
60W and 40W bulbs are connected in parallel and then connected in series with 100W bulbs
When an incandescent lamp marked with 220 V 100 W works normally, what is its resistance? What is the current through the incandescent lamp?
P = the square of U / R
100=220*220/R
Resistance R = 484 ohm
Current I = u / r = 220 / 484 = 0.45a
What is the filament resistance of electric lamps marked with 220 V and 100 W
You can calculate that electric lamps are pure resistive components, and all the electric energy is converted into light energy and heat energy,
According to the formula: P = UI, I = u / R, the final formula is: P = (U * U) / R
So, r = (U * U) / P
It turns out that the resistance is 484 ohm
For the bulb with rated value of 220 V 100W and 220 V 25W, which bulb has high filament resistance? Which bulb has thick filament?
There should be the whole process of calculation
The diameter of tungsten filament of 220 V / 100 W inflatable bulb is 0.0436 mm, the length is 912 mm, and the resistance is about 33.6 Ω at 20 ℃. The diameter of tungsten filament of 220 V / 25 W vacuum bulb is 0.0209 mm, the length is 921 mm, and the resistance is about 143.7 Ω at 20 ℃
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