Resister or Resistor?

Words and spelling catch my eye.  What am I?  What words do I use to express current feelings and explorations?  I see the word “resistor” on social media and it looks wrong.  I went to several dictionaries.

resistor

[ri-zis-ter]
noun, Electricity.
1.  a device designed to introduce resistance into an electric circuit.

resister

listed as the noun for “resist.”
1. to strive to fend off or offset the actions, effects or force of
2.  to remain firm against the actions, effects of for of; withstand
3.  to keep keep from giving in to or enjoying; to offer resistance.  synonym:  oppose

 

What are you?