I have a 24V 20A power supply. 24V is constant not variable.
I want to use a heating wire such as nichrome one for an experiment.
It means I need to pass around 4.5 or 5A through a pure resistive element. I need to find a way to adjust the current through the heating wire. I can do it by varying the voltage across it. The heating wire has resistance about 1.5 ohm.
So I guess I have two options: First one is to add a series power potentiometer which can handle currents up to around 10A.
And the second option could be using an opAmp and 24V as its rails.
Since I cannot find such power potentiometer how can I implement a 0-12V varying output with max current upto at least 6A from the power supply I have?
Or any other ideas to vary the current through the resistor?