Re: [Phys-l] AC LED demonstrator

[Brian Whatcott <betwys1@sbcglobal.net>]

The resistor might best be specified as a 1 watt device.

If the choice is a bicolor LED, then you might also consider a 0.1 uF
200 VAC wkg capacitor instead of the resistor.

It might then be entertaining to measure the power consumed by each rig.

Brian W

At 08:49 AM 6/15/2007, you wrote:
> A classic electricity demo! Use a bicolor LED and a 22k ohm resistor, both
> available from Radio Shack. Solder the resistor to one wire (cut slightly
> shorter) of an extension cord. Solder the LED to the other end of the
> resistor and the other ext cord wire. Tape it, plug in, spin it.
> Fascinating!
>
> tmzoughi@kennesaw.edu writes:
> >Hi all:
> >
> >I remember seeing a set-up made up with a power cord connected directly
> >to a
> >wall outlet and used to demonstrate ac currents. I saw two versions of the
> >set up, one with a red LED and the other with a bicolor LED. I am hoping
> >that one of you has information on how to build one.
> >
> >Taha


Brian Whatcott    Altus OK    Eureka!