DigiTan
New Member
You're forgetting that I = V/R. If you supply a fixed 9 Volts, and your circuit has some load R, you need only measure to current going in.
The current knob on your supply either does one of two things. (1) It either sets the current limit (compliance), so that when the current grows to large, it will shut off or lower the voltage to prevent damage. Or (2) it sets the output current to some fixed value by ramping up/down the voltage until that exact amount of current is entering the circuit. It's tough to say which role it has without a picture of it.
The current knob on your supply either does one of two things. (1) It either sets the current limit (compliance), so that when the current grows to large, it will shut off or lower the voltage to prevent damage. Or (2) it sets the output current to some fixed value by ramping up/down the voltage until that exact amount of current is entering the circuit. It's tough to say which role it has without a picture of it.