If two bulbs of 220 V 60 W and 220 V 40 W are connected in series and parallel in 220 V circuit respectively, 40 W is brighter, but why is the resistance of 40 W bulb larger than 60 W? If two bulbs of 220 V 60 W and 220 V 40 W are connected in series in 220 V circuit, 40 W is brighter, but why is the resistance of 40 W bulb larger than that of 60 W?

If two bulbs of 220 V 60 W and 220 V 40 W are connected in series and parallel in 220 V circuit respectively, 40 W is brighter, but why is the resistance of 40 W bulb larger than 60 W? If two bulbs of 220 V 60 W and 220 V 40 W are connected in series in 220 V circuit, 40 W is brighter, but why is the resistance of 40 W bulb larger than that of 60 W?

R = u ^ 2 / P. when the rated voltage is constant, the resistance R is inversely proportional to the rated power P,
So the resistance of 40W bulb is larger than that of 60W bulb;
P1 = 220 ^ 2 / 40 = 1210 Ω
P2 = 220 ^ 2 / 60 = 807 Ω

Two 110V, 40W and 60W bulbs are connected in parallel on the 220V circuit. Which one burns first?
Can you answer why?

The resistance of 40W is 14.5, and that of 60W is 32.7, so the current of 40W is much larger than that of 60W on the circuit of 220 V, so it is burned first

If the "220 V 100 W" and a "220 V 40 W" bulb in parallel in the circuit
Which is brighter?
It's better to say the reason

The 100 watt one is brighter
The bulb can be seen as a pure resistance, so p = u ^ 2 / R
The higher the actual power, the brighter the bulb
When a 40W bulb and a 100W bulb are connected in parallel, the voltage at both ends of the two bulbs is 220V, and their actual power reaches the rated power

If the three bulbs of "220 V & nbsp; & nbsp; 60 W", "220 V & nbsp; & nbsp; 40 W" and "220 V & nbsp; & nbsp; 100 W" are connected in parallel to the 220 V circuit, their total power is ()
A. 200WB. 100WC. 60WD. 40W

The bulb is connected to the 220 V circuit, the bulb lights normally, and the power is equal to the rated power. The total power of the bulb is p = P1 + P2 + P3 = 60W + 40W + 100W = 200W, so select a