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can I turn 2A into 5A?

I am makinga hot wire foam cutter and using the hot wire foam calculator from Shawn James and it says that I need a supply of 7.5V 5A, but my transformer only gives 2 A. I've seen voltage multipliers and I don't know if there's a current multiplier. If so, please give me the instructions to make one.

Voltage multipliers are able to up the voltage at the cost of amperage. Doesn't really work the other way around. If you want more current you gotta have a transformer that can offer that amount of current. Or take several transformers that offer the same voltage and current and wire then up in Parallel. So if you have 3 of those transformers you would have your 7.5V with up to 6A of available current.
quatch4 years ago
A transformer can turn voltage into amperage. When you decrease volts going through a transformer you increase amps, also works backwards: increasing volts drops amps.

That said, you need a different transformer (supply), or a different wire here.
You've missed the point: you may well have enough power, all you need to do is change the hot wire.
I am making a hot wire foam cutter and using the hot wire foam calculator from Shawn James and it says that I need a supply of 7.5V 5A, but my transformer only gives 2 A.

How many volts do you have ? Shawn's supply can deliver 37.5 Watts to the wire, via a 1.5 Ohm hotwire ?