John,
Yes, this is how it works.  The come in two flavors.  Zero crossing and 
non zero crossing.  Less noise with the zero crossing.  There are 
several different current settings.  Some devices take 5, 10, 15, or 25  
mA, to light up the LED.  Make sure your design will supply the proper 
current.
bill

John Waters wrote:

>Hi All,
>
>I want to use a Triac Output optoisolator like the MOC 3023 to turn on/off 
>110V ac supply to a load. Do I just apply a dc voltage to the input diode to 
>turn on the output triac (so that ac current will flow through the load) and 
>apply a 0V to the diode to turn the triac off (no current flows through 
>load)?
>
>Thanks in advance!
>
>John
>
>
>  
>
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