I am curious about how and why if you take 2 purely resistive incandescent lamps (light bulbs) that are rated at 40 watts and 60 watts, both 120V AC (RMS) ratings, if you put them in series and feed them 240V AC (RMS), what will happen to those 2 lamps? I heard somewhere that the 40 watt light will actually glow brighter than then 60 watt light and I would like to understand why.
I have a 110V to 220V voltage converter so I can actually test this.
I believe if I use 2 same wattage lamps (such as 60W and 60W) and double the input voltage from 120V to 240V, the 2 lamps should burn normal brightness. "Strange" things start to happen when they are different rated wattages. Also I wonder if they are grossly different rated wattages such as 25W and 60W, what might happen.
You can assume that the wires connecting all of these are of negligible resistance.