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Which lamp is brighter when it is connected to the 220 V power supply after it is connected in series with the 220 V 40W lamp A and the 220 V 100W lamp B
R1=U^2/p1=220*220/40=1210
R2=U^2/P2=220*220/100=484
Series connected in the 220 V circuit, power and resistance is proportional. L1 resistance, power, brighter
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After connecting a 220 V, 100 W light bulb a and a 220 V, 40 W light bulb B in series and connecting them to a 380 V power supply, which one of them will burn out
It will burn out
Festival lantern is composed of 20 small bulbs in series. If it is connected to the lighting circuit, the current at the power plug is 200mA, then the current through each small bulb is (), and the voltage at both ends of each lamp is ()
200MA,11V
There is a festival lantern made of 20 small bulbs in series. If the current at the power plug is 200mA, then the current through each small bulb is 200mA______ mA．
Current law of series circuit: in series circuit, the current is equal everywhere. Because small bulbs are in series, the current is equal everywhere in the circuit, that is, the current passing through each small bulb is equal to the current at the power plug, which is 200mA. So the answer is 200
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