CHAPTER 4

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Light Emitters and Receivers

We will explore light-emitting devices that turn electric current into light, such as incandescent lamps and light-emitting diodes (LEDs). The relative efficiency of these two types of light-emitting devices will be compared, and some experiments and simple projects will be introduced. Later on, photonic receiving devices that convert light into electricity will be examined. These receiving devices include solar cells and photodiodes. We shall see later that light emitting diodes and small signal germanium or silicon diodes convert light into electric current.

Incandescent Lamps

An incandescent lamp is made ...

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