#### StudentSA

##### Member

I need help understanding transformer operation, I have been working on a Microwave Oven Transformer conversion commonly found on YouTube and the likes where the secondary coil is replaced with 2 turns of thick gauge wire (50/75mm^2). The idea is that voltage is stepped down and current is increased.

If the secondary side is "shorted" onto some metal, the high current transfer can be used to spot weld.

Anyhow, Im super confused on the theory... how is the current through the secondary calculated. I want to understand how secondary turns affects current and how resistance of the secondary (i.e from using thicker wire or shorter length) affect current. Can we actually calculate a value for current given the turns and resistance.

From my experimentation, I believe the primary coil (original, not tampered with) is 240 turns and measures (1.6 Ohm). This makes sense as two turns on the secondary with thick wire has produces a secondary voltage of 2V from 240Vac on the primary (for my side of the world).

I guess the basis of my question is "how do I maximize current at the secondary and derive a formula to calculate the expected current?"

Thanks,

StudentSA