I checked the resistance of my glue gun as it was cooling down.
It was about 300 Ω, and as it cooled, the resistance increased. It is now virtually cold and it is about 850 Ω.
It seems odd, as I would have expected the resistance to decrease as it cooled.
I then measured the current. It took about 200 mA, falling as it heated up to about 125 mA. It would have gone lower but I didn't wait all that long.
The mains is 240 V and the glue gun is rated at 40 W. It takes about 300 W very briefly on turn-on, then wanders down to around 40 W
I can't work out why the resistance is falling as the glue gun heats up, or what stops it taking loads of current.
Has anyone got any ideas?
It was about 300 Ω, and as it cooled, the resistance increased. It is now virtually cold and it is about 850 Ω.
It seems odd, as I would have expected the resistance to decrease as it cooled.
I then measured the current. It took about 200 mA, falling as it heated up to about 125 mA. It would have gone lower but I didn't wait all that long.
The mains is 240 V and the glue gun is rated at 40 W. It takes about 300 W very briefly on turn-on, then wanders down to around 40 W
I can't work out why the resistance is falling as the glue gun heats up, or what stops it taking loads of current.
Has anyone got any ideas?