|Originally posted by 84fiero123:|
Actually I think its called a rheostat, if it is the coil thing ...
Nope. That's a multi-tapped power resistor. It might sometimes be called a ballast resistor.
A rheostat is a continuously-variable, usually wire-wound, power resistor that's value can be changed easily by turning a knob or moving a slider.
[This message has been edited by Marvin McInnis (edited 03-06-2014).]