what happens when I hook a 30v power source to a 12v battery
By kurt, Section Homebrewed Electricity FAQ Posted on Wed Jun 2nd, 2004 at 03:33:25 AM MST
the battery pulls the source voltege down to its level

Think of volts as pressure and amps/current as volume and watts as mass when I higher voltage (pressure) source is hooked up to a battery the battery draws the voltage down to its level and converts the extra voltage into current/amps (volume). This is like if you hook a 90 psi air source up to a totally flat car tire for 10 seconds and then check the pressure in the tire. The tire will not be at a 90 psi pressure (unless it is a very high volume air source). The pressure will have dropped but the volume of air will have increased. This is not a perfect example of what happens to the voltage and current when a high voltage alternator is hooked to a lower voltage battery because the battery will pull the voltage in the entire alternator down to battery voltage + the voltage drop of the rectifier and current is increased creating heat in the windings of the alternator. any watts(current*voltage) that is converted to heat is lost.

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