On Friday, June 20, 2014 1:28:04 PM UTC-4, Mark Lloyd wrote:
On 06/20/2014 09:41 AM, Ralph Mowery wrote:

"TimR" wrote in message

...



An LED is a Light Emitting Diode. A diode is a device that transmits in

one direction. It's essentially a short in that direction.







There is no basic differance in a LED and any other diode. Within the

voltage/current ratings a LED acts just as any other diode does except it

often emmits light.





True, although a LED has a low reverse breakdown voltage (just a little

higher than the forward breakdown voltage). The series resistor protects

it during both half-cycles of the AC.


Yeah. The LED sounds less likely now that I think about it. It wouldn't act as a short unless the current limiting series resistor had failed, and if that happened the LED should burn out and go open, stopping the chime.