As I recall, most automotive jars have six cells in them, each putting out somewhere around 2.17 VDC (nominal) x six cells. The individual cell voltages can be higher or lower than that. A jar has to complete a circuit across the six cells between the positive and negative terminals. Something opens in any one of the cells or from either terminal to the last cells in the jar, or a short across two of the plates in any of the cells...and its over. Sure jars can and do weaken over time across the cells as the plates scale or whatever, but on occasion jars have always been known to and sometimes will just go dead depending on the failure. Compare it to a light bulb going out when the filament suddenly opens and fails to complete its electrical circuit. You go to bed and shut off a perfectly good working light bulb, get up and attempt to turn the same light bulb on...and nothing happens until you change out the now bad bulb.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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