How do you change the amp value of a battery

I am trying to make a voltage regulator for my car.
My car puts out 14v and 500 amp battery.
I can not tell Multisim that I want a 500 amp battery.
How do I change the value?
This is important because I have to make sure I have at least 15amps output. No way to do this so far. Program is worthless.

Shane711,
Most multimeters can only handle ten amps or less, so it is not surprising that yours burned up.
How did you connect the multimeter while trying to measure the battery current? Cars have large, heavy wires connected to the battery because the large currents would destroy smaller wires. Your multimeter does not have connections or wires anywhere near as large as the battery cables. To measure the current you need to disconnect one of the cables and connect the meter in series with the cable. If you attempted to connect the multimeter in parallel with the battery as you would to measure voltage, you shorted the battery through the meter and probably had hundreds of amperes flowing, at least until a fuse blew or some wire burned out.
Your specification for the voltage regulator does not make any sense. A voltage regulator has an output voltage specification - yours is 12 V. It also has an input voltage range specification. You did not specify an input range. The output current is determined by the load via Ohm's Law. The specification includes a maximum current - Is that what you meant by 15 amps? Some regulator circuits also have a minimum output current specification, often a few mA. Optional specifications include tolerances on voltages, power dissipation, transient response characteristics, and so on. The design of the circuit depends on all of these specifications. You will probably not find a single device which operates as a voltage regulator with 12 V output at up to 15 A. A regualtor like that will probably contain one or more power transistors, some ICs, resistors, diodes, capacitors, and inductors.
Any simulator is only as good as the models used. From what Tien P. said in his earlier post, the battery in Multisim is an ideal voltage source. If so, it should easily produce currents of 1000 amperes. Just put a 12 milliohm resistor across the battery. As I said yesterday, you will need to create a battery model circuit which has the characteristics you want in your battery. What do you expect the output voltage to be at the battery terminals when drawing 1000 amps? What should it be with no current drawn? What should it be at 1, 10 , and 100 amps?
Lynn

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