If you have a volt meter on the dash board , it could mean nothing or it could mean that the alternator output is fluctuating. It is is only minor movement, it is probably nothing to worry about but if the fluctuations are rapid and large, you have a problem. Needs to be looked at by a mechanic.
v on a ammeterusually means Volts
Not necessarily. There are a lot of factors that can keep you from reading 14 volts at the battery, such as corrosion in the cable from the alternator to the battery.
Yes- 120 volts is just the label given to it for ease of the consumer. The voltage actually fluctuates several times every second, and can reach as high as 175.
With the engine running you should have a reading of 13.5 to 15.5 volts at the battery. So 14 volts is acceptable.
This is the type of reading that you would get with an open neutral.
12.5 volts
What system? Some circuits go to 0 volts when cranking. If you are reading voltage at the battery, then the battery is dead.
A fully charged battery will read 12.6 volts. A battery reading 12.4 volts is 75% charged. 12.2 volts = 50% charge, 12.0 = 25% charge. You should use a battery charger to charge any battery reading less than 12.4 volts before installing it on the vehicle.
With a fully charged battery (12.68 volts) and engine running at idle with no accessories on, 14.5 volts. You will not get a accurate reading if the battery is not fully charged.
I think 1 volt/bar when expressed in db you need to add 200 db to get reading in volts per micro pascal.
Alternator may not be charging battery properly Check with a volt meter With a fully charged battery and engine not running reading should be around 12.8 volts With engine running reads should be 13.8-14.2 volts
With engine running 13.8-14.2