Re: Amps vs volts

Posted by INCase on January 05, 2023 at 07:01:10 from (209.221.240.192):

In Reply to: Amps vs volts posted by rrlund on January 05, 2023 at 06:36:27:

maybe comparing to air pressure is a good analogy. say your tire should be 30psi but it is only 20psi. you need a source of higher air pressure than 20psi for any air to go into the tire. And at least 30psi to get it to 30psi but that would take forever to get there. Similar thing with voltage and a battery. if the voltage regulator sees less than its set voltage it will allow more voltage into the battery to charge it up within limits of course. most modern cars charge at 14 volts give or take. as soon as you turn the car off the battery will read between 12.6 and 13volts.

AMPS for electricity is basically like flow rate. to fill your tire the air source will fill it at X cubicFeet/minute at X psi. A generator/alternator is similar. depending on the demand it sees (low battery voltage) it will send X AMPs at Y volts until the desired voltage is reached.
higher pressure can deliver faster. lower pressure say pumping your tire from 28 to 30 PSI with a 30PSI source will take a long time with a small hose but more quickly with a larger hose (of course valve stem is limiting factor (resistor) in this case)

This is also why there are diodes in the electric circuit as well. if the battery voltage is higher than the source (another battery or generator ect) then power could flow backwards and drain the battery. the diode is a check valve to prevent that.

everything flows from high to low. high voltage to low (good battery with nothing attached will over time go dead), high pressure to low (air is always wanting get OUT of your tire), High Temperature to low (house gets cold), high stress to low (things break)

rough and hurried explanation with limited details but hopefully helps a bit.

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