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Pz220-100 filament resistor works normally for 10h and consumes electric energy 1. When the incandescent lamp marked with "pz220-100" works normally, the filament resistance is_____ Oh, working normally for 10 hours, what is the power consumption_____ KW·h. 2. An incandescent lamp is marked with "6V 3W". If you want to connect it to 9V power supply, in order to make it shine normally, you should connect one in series__________ If the current is applied for 10 seconds, the total work done by the current is____ J.
R = u / I = u * U / P = 220 * 220 / 100 = 484 Ω
W=PT=0.1*10=1KW.H
Second question:
First calculate the current required for the lamp 0.5A and the resistance 12 Ω
According to the current, the resistance is 18 ohm at 9V
Finally, the series resistance is 6 ohm
The total work of 10s time current is w = uit = 9 * 0.5 * 10 = 45j
A bulb is marked with "220V 100W". When the lamp is connected to 380V, how much resistance should it be connected
The simplest way is to connect two "220V 100W" in series to 380V, which can work normally
It's very easy to calculate the resistance for you, but no one has considered the safety for you! The sadness of middle school education, only reading books, not looking at reality!
The power consumption of this series resistor reaches 80W, you know! You can't find such a resistor! And it's a serious waste of energy
My method is the most reliable and safe! Two "220 V 100W" series lights will turn red, you can also use one 220 V 100W and one 220 V 150W, so that the 100W will light normally
I would like to remind you that we should consider the problem comprehensively
RELATED INFORMATIONS
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