Two "220 V 40 W" electric lamps are connected in parallel and then connected in the 110 V lighting circuit. The sum of the actual power of the two electric lamps is () A.20 W B.15W C.10W D.5W

Two "220 V 40 W" electric lamps are connected in parallel and then connected in the 110 V lighting circuit. The sum of the actual power of the two electric lamps is () A.20 W B.15W C.10W D.5W

A yes
If the voltage is 220 V, the total power of the two lamps is 80 W; if the voltage is 110 V, the total power is one fourth of the original
(P＝U＾2 /R)

There are two station lights L1 and L2 marked with "pz220 V 60W" and "pz220 V 100W" respectively. If two lights are connected in series on the 220 V circuit, a L1 is brighter, B L2 is brighter

R = u ^ 2 / P when the voltage is the same, the smaller the power is, the larger the resistance is, so the L1 resistance is larger
In series, P = I ^ 2R, when the current is the same, the actual power with large resistance is large, and the light is on, because L1 resistance is large, so L1 is on

When two lamps L1 and L2 marked with "220 V & nbsp; 40 W" and "220 V & nbsp; 60 W" are connected in series in the circuit, both lamps emit light, and the actual power consumption is P1 and P2 respectively, then ()
A. P1 > P2b. P1 = P2C. P1 < P2D

According to P = u2r, the resistance of L1 lamp R1 = u2p1 = (220V) 240W = 1210 Ω; the resistance of L2 lamp R2 = u2p2 = (220V) 260W = 807 Ω, the two lamps are connected in series, and the current is equal. According to the formula P = I2R, the higher the resistance is, the greater the actual power consumption is, so the actual power consumption of bulb L1 is larger. So select a

Can two lamps of 220 V 40 W and 220 V 100 W work normally in the 440 V circuit in series? Why?

It can't work normally. Because in the series circuit, the function of each electric appliance is to divide the voltage, that is, the ratio of the voltage at both ends of each electric appliance is equal to the ratio of their resistance. You can calculate the resistance by calculating the rated power and rated voltage of two electric lamps. The first resistance is 1210 Ω, and the second one seems to be 484 Ω