If what you have is a capacitor you had better be careful. Capacitors hold electricity to give an initial boost when the circuit is completed the next time the appliance, etc., is turned on. For example, my large radial saw has two huge capacitors that help get the blade turning from a dead stop and not cause a huge line draw of current which could trip the the circuit breakers.
DO NOT TOUCH the poles of a capacitor because if it is charged you might just get the shock of your life, or end of your life as it may be. That is why most electrical equipment like televisons, radios, and amplifiers state on the back that you should not open the case because there are no user serviceable parts inside. They don't want you to stick you hands in there and get shocked or worse. Electrical repairmen know how to bleed off the stored electrical charge from capacitors. That must be done first BEFORE repairs are started.
The two capacitors in my saw are about as big as beer cans and can kill in a hurry if some fool ever touched them the wrong way.
New Knuckleheads? Thank, you, Jesus!!