- #1
magmash
- 18
- 0
Hi guys
I have been playing around with a piece of tungsten wire by supplying it with 12Vdc and measuring the current draw to see how much the resistance changes when the wire is glowing hot. while doing this i am not getting any change in the resistance, the wire has the same resistance when its cool (no power supplied), and when its Glowing hot (supplied with power), shouldn't the resistance change when the temperature rise in the wire ? .
I am using Ohms law to calculate the resistance while the tungsten wire is being supplied with power
R=V/I, i am measuring the voltage with a Multimeter and the current with a Clamp meter (Fluke).
I have been playing around with a piece of tungsten wire by supplying it with 12Vdc and measuring the current draw to see how much the resistance changes when the wire is glowing hot. while doing this i am not getting any change in the resistance, the wire has the same resistance when its cool (no power supplied), and when its Glowing hot (supplied with power), shouldn't the resistance change when the temperature rise in the wire ? .
I am using Ohms law to calculate the resistance while the tungsten wire is being supplied with power
R=V/I, i am measuring the voltage with a Multimeter and the current with a Clamp meter (Fluke).