Light Effects of Electricity
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FIGURE 36-21
Light created by an LED.

The production of light can also be an effect of electricity. An example of this is the LED. The LED is a semiconductor diode that creates light by emitting photons from its PN junction when a current flows through it Figure 36-21. At one time, LEDs were available only in the red, green, and yellow tints. More recently, they have become available in many different colors and have grown in light intensity. They are now replacing traditional bulbs as lighting sources and produce as much or more light with less heat loss, using much less energy. LEDs are also being used as headlights on some top-end cars, and it is likely that as LED technology improves and prices come down, they will be installed on more and more new vehicles.