I read somewhere that the voltage going to the led determines how much current it will draw, is this true?
Voltage determines current if it a resistive load. there is no resistance value for LED. its semiconductor junction.
junction has specific forward voltage. voltage above it draw high current if there is no any series resistance. voltage below its forward voltage won’t flow any current. this is why LED drivers are designed for constant current. no constant voltage.
There is a forward voltage @ drive current. its another thing.
Although they are related, with an LED, it’s better thought of from the opposite perspective. Operating current (and temperature to a much smaller degree) determines voltage.
Pavithra_uk is not correct. The Vf of an LED isn’t a finite point value. Vf varies with I (current) and with temperature of the die (junction). That being said, the range of Vf where current will flow without flowing far too much is a narrow band. That is why LEDs can only be satisfactorily driven by using a constant current regulator.
PPtk
i am continually learning that i have a lot to learn
Me too! I enjoy reading about it, but learning it? Naw. At this point in my life I’m doing good to hold on to what I have learned LOL I know all I need to know about flashlights……….buy-um, feed-um juice, turn-um on & play with-um :party: I’ll leave the learning for others. My poor ole brain is clogged up enough J)
Keith
I enjoy learning. It’s remembering that sucks. Damn cosmic rays tunneling holes in my poor soft tissue. Or maybe it’s the Marguerita’s.