I modified a microwave trasformer and i got this measurements for the Voltage. I need around 140A at 5V (voltage isn't really important). I'm using a bridge rectifier to get DC and it can hold 150A. In this case the transformer has 10 loops of wire but the voltage goes from 8V to 40V and I'm worried that the A will go above 150 and my rectifier will get destroyed

 

Welcome to AAC,
Did you remove the magnetic shunt of the transformer?? And under what conditions does the voltage vary from 8 volts to 40 volts??? A whole lot of information is missing, including what is the load that draws 140 amps .
AND I do not unzip videos. So we need text and words to explain.

 

Duplicate https://forum.allaboutcircuits.com/threads/transformer-voltage-fluctuating.192587/

 

Hello,

As Max said, there is an other thread running.

Bertus