Understanding a simple electronic device

Basically "walk" the path, starting at + of battery (red lead) and see where it takes you.

If you come to a switch think bridge when its closed, no path if its open.

And see how you get all the way back to the - lead of the battery (black lead).

If you walk a path that goes thru switch, an R, an LED and get back to - lead of
battery then LED is lit when path is continuous, eg. switch is closed.....

Note LED is a diode, so it is polarity sensitive, one way no current will flow thru
it, polarity opposite configured it conducts and lights up.



Regards, Dana.

Hi M,
Note, that an LED must have a current limiting resistor in line with it to keep the current at the correct level, so don't connect a battery straight across the LED or it will glow too brightly for a very short time.
C.