The fuser lamp (the heating element) in my laser printer broke from one of the ends. I measured the resistance of the, almost full length, wire which was 6 ohms. I tried to fix it by connecting the wire to the printer but the wire kept breaking after a couple seconds at the connection (it was exposed to air + mechanical stresses caused by my tinkering).
So, I decided to make my own heating element from nichrome, 7 ohms to be safe. Now comes the strange part: this 7 ohm element causes the fuse of the printer to burn almost instantly. Confused, I measured the current through and the voltage over the original broken element and they were 5A and 230V, I assume 50Hz AC, even though 6 ohms and 230V should give 40A (which, I know, is way too high with the 6.3A fuse).
I came up with two explanations: 1) I didn't measure the reactance of the original element (it's a coil). 2) The original element's resistance goes up a lot when it heats up (I don't know the material). But neither of them seems to be significant enough to raise the impedance high enough.
So, my question is: What could cause the low current?