Hello, I am in the process of building a 900W+ (60v ~14a) RC EDM generator. I am using a heavily modified hairdryer heating coil at 4 Ohms resistance at about 1200 watts. According to my calculations (derate transformer output wattage 20% in order to obtain minimum wattage required), I needed a minimum of 720 watts of dissipation on the resistor. Would it be okay to use a higher wattage resistor without any amperage drop on the circuit while it is operating?

active| newest | oldestAnd coils become an inductor when current flows through them.

That is why resistors can be inductive.

IF you wind the resistive material in such a way so that current flow in one direction is matched by current flow in the opposite there is almost no inductance.

The picture below demonstrates one way to make a non-inductive resistor.

:-)You can increase the wattage ( a bigger sized component )

as much as you want to.

The beneficial affect is a bigger wattage runs cooler because of

the surface area and also you won't burn your hand.

A