Resister (noun)

1. A person who opposes or refuses to comply with something.
2. A device that resists the flow of electric current.

Origin:

Mid 17th century: from french résister, from latin resistere "resist".

Examples:

1. The resisters of the new law organized a protest.
2. The resisters of change have been the greatest obstacle to progress.
3. The resisters of the dictatorship were arrested and imprisoned.
4. The electrician installed a resister to regulate the current.
5. The resister in the circuit controlled the amount of electricity flowing to the motor.