I'm trying to test the resistance of a wound coil around a solenoid.My ohmmeter reading 0Ω each time, is it because of the coating on the copper wire thats preventing me from reading its resistance?I need it to be at around 8Ω if anyone has any tips on getting a near to exact impedance then that would be awesome!
You need one more sensitive ohm-meter able to read 0.1 ohm. Most digital multimeter is able to do that. Short two test probe together to read both leads wire resistance,mostly is about 0.3 ohm. Subtract 0.3 ohm from the reading. Example: if you get 8.3 ohm reading, in facts it is 8 ohm. Clean the copper wire with sand paper to remove the coating before taking measurement. If you are making a 8 ohm coil, cut a few feet of wire then measure its resistance. Use the same method until you get the correct length for 8 ohm.
if the copper winding is varnished, and there are no terminals to hook on to, then you need to scrape off the varnish for a 1/4 inch or so, to expose bare copper, then use the lowest range on your Ohms meter. If you cannot get a clear reading, then hook it up to a 12 volt battery and measure the current R = V/I
The temperature coefficient of copper is 0.004041=c (we are going to call it c here) the formula for finding the hot resistance while temp has adjustments in a twine is R=R(ref)(a million+c(T-T(ref)) plug in R=ninety(a million+.004041(40)) R=104.fifty 4 this is the resistance So, you like the present to be a similar. V/R=I 230/ninety=2.fifty six Now V=IR V=2.fifty six*104.5476 V=267.18 Volts
