The often-used analogy is that voltage is to water pressure as current is to water flow. The voltmeter is like a pressure gauge on your water system and tells you the potential available to move electrons through the electrical system, just a pressure gauge that indicates the potential to move water through the system.
An ammeter is like a flow meter and indicates the rate electrons are moving through some point in the system, just like a flow meter tells the rate at which water is moving through the system.
Ammeters were once popular, probably because they're simple to interpret. "+" is good, "-" is bad. But they require either running a heavy gauge wire into the dashboard, or installing a remote shunt in the vehicle. Voltmeters are a bit trickier to interpret, since the difference between "good" and "bad" is only a volt or two. When charging systems were producing less that fifty amps, ammeters made sense. But as charging systems became more powerful, the need for current shunts made the voltmeter a better choice, since it only requires a single, light-gauge wire. Also, it's tricky to detect a slight discharge on a 100 amp ammeter, while a discharge state looks the same on a voltmeter regardless of charging system capacity.
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Today's Featured Article - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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