On Mon, 01 Dec 2008 21:28:51 +0000, Orchid XP v8 <voi### [at] devnull> wrote:

>> Solar panels. Infrared remote control receivers (i.e., photodiodes). 
>> Optical sensors on doors.
>
>Infrared receivers *respond to* light. They do not actually *transform* 
>it into electricity.

They respond to light (IR) by the light energising the base of a transistor the
same way an electric current does. In fact you can make a photo transistor by
opening the can of a metal clad tyranny. 

-- 

Regards
     Stephen

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