Posted by Janicholson on January 05, 2023 at 09:01:27 from (199.17.6.141):
In Reply to: Amps vs volts posted by rrlund on January 05, 2023 at 06:36:27:
Simple as possible explanation: Voltage is the push on the electricity in a wire. For voltage to actually move electricity (electrons) in the wire there needs to be a circuit that connects the negative of a voltage source to the positive of that source. A 12v battery is just called 12volt, it is really a 12.6 volt battery when charged.if the voltage source was 12v exactly, there would be no charging. To charge the charging voltage must be above 12.6 (usually, as John T points out about 14.2, or a bit more) The chemistry of the battery is not going to take more charge, it is full, so there is very little actual flow into the battery. If the battery was used to start an engine, it now has room for more chemical change and at 14.2 it accepts more charge. In 10 minutes or so the battery is full again, and actual charging just stops because it is full. The amount of discharge (a cold diesel engine cranking for a minute) allows more room in the battery and this allows the amount of amps to increase at first, then decrease as the full mark is reached. In a complete circuit the amount of amps depends on the amount of voltage, and the amount of resistance. an example is the starter motor, it has much less than 1/2 ohm of resistance (near none). This causes the battery to send hundreds of amps through the big wires to spin the engine. This reduces the chemical charge in the battery. when the engine starts the alternator replaces those electrons by pushing them back into the battery changing the chemistry to full charge. The starter motor may draw 275 amps for 30 seconds. The alternator may take 10 to 20 times that to refill the battery. Jim
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