How does a photoelectric cell work - Explain that

op70oppm

Photoelectric cells ,[link widoczny dla zalogowanych]
Last updated: December 4, 2009.

Have you ever been in one of those restrooms where the faucets come on
automatically when you wave your hands underneath them? Or walked
through an electric door that opened just as you approached? Maybe
your home is fitted with invisible "magic-eye" beams that "trip
up" intruders by sounding an alarm? Or perhaps you've got a
calculator that makes power with a little built-in solar panel? All
these things are examples of photoelectric cells (sometimes
called photocells)—electronic devices that generate electricity when
light falls on them. What are they and how do they work? Let's take a
closer look,[link widoczny dla zalogowanych],[link widoczny dla zalogowanych],[link widoczny dla zalogowanych]!

Photo: The mini solar panel on this pocket calculator uses a type
of photoelectric cell known as photovoltaic: when light falls on it, it produces enough voltage to power the display and the electronics inside.