Say I have an unknown led light, independently several person know it could be 12v or 24v or 110v even 220v
Say It's rated for 9v (and you dont know), let's say you start applying fewer volts until it start turning on and stronger, but how can you know the PROPER and CORRECT voltage?
Does it apply for a small motor? Rated say at 6v but you think it's rated at 12v or 9v.
What's the rule resistance? watts? amps?
Thanks in advance