There are many YouTube videos of people cutting apart microwave power transformers to make electromagnets, using the primary coil. It seems that they use line voltage (120 vac) across the primary. But these primaries measure around .6 ohms resistance. So Ohm's law says they will produce a load of around 200 amps when powered with 120 vac. This is impossible with ordinary household circuits.
What am I missing here? It seems that I'd need around 6 ohms resistance if I wanted to limit the current draw to, say, 20 amps, so I'd need to use 10 transfomers in series or put a 5.4 ohm resistor in series with one transformer.
If I did the latter, what wattage rating would the resistor need?
Apologies for a very shallow understanding of this subject.
Thanx!
What am I missing here? It seems that I'd need around 6 ohms resistance if I wanted to limit the current draw to, say, 20 amps, so I'd need to use 10 transfomers in series or put a 5.4 ohm resistor in series with one transformer.
If I did the latter, what wattage rating would the resistor need?
Apologies for a very shallow understanding of this subject.
Thanx!