I bought a whole bunch of components for mounting on a circuit board (I'm new to electronics and I'm just experimenting at the moment) - things like LED's, small microphones, buzzers, very small speakers, motors, displays, IC's, Op Amps, etc.
I'd like to know the method for finding out what the power requirements for each component is. What tests can I do with my multimeter to determine the needs of each component without damaging the component?
The only method that comes to mind (with my limited knowledge) is to attach a DC power supply, such as a 9V battery or a 4.5 V battery pack and run the current through a resistor in series with each component, starting at very high resistors (MΩ) and working my way down to less and less resistance, all the time monitoring the component to see of it is operating. This seems very imprecise and is just trial and error until I get in the ballpark of what each particular device needs.
Is there a better way of doing it? Does it have something to do with measuring the resistance of each device?
I know I can use Ohm's Law for V/R = I where V = voltage of battery pack and R = resistance of component, but that doesn't really tell me the requirements of the component - or does it? The motor for instance runs on 2.8V and 8.2V - just faster in the 2nd case. Things like the displays are much more prone to damage and I can't just run some random voltage through them and hope for the best.