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I just bought a Mastech HY3010E Single-Output DC Power Supply. What I'm trying to do is use the Current & Voltage at the same time. I have a unit that runs 8.0V DC @ 3.5 AMPS. I can only use either voltage or current, not both. Is it because I have a single output and need a dual? Or am I just missing something.
And got the following answer:
I think you've missed something called Ohms law. Voltage = Resistance * Current. To get 3.5A at 8V you need a load of 2.28 Ohms. Any other load and you'll get a different current. There is no such thing as a power supply which will always output both the voltage and the current you have requested, it's not physically possible. What the controls on the power supply are doing is setting the maximum voltage and maximum current that the supply will output. A power supply can either be constant voltage in which case the current changes depending on the load or constant current in which case the voltage changes depending on the load. When something claims that it's power requirements are 8V and 3.5A what they mean is that it requires 8V and may draw UP TO 3.5A. Any power supply that is rated at that current or higher will work fine as long as the voltage is correct.