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Another common use of electronics is to produce light. The simplest electronic light circuits are LEDs, which are the electronic equivalent of a light bulb.

LED stands for light-emitting diode, but that won’t be on the test, at least not for this chapter. However, it will definitely be on the test for Book 2, Chapter 5, where you learn how to work with LEDs.

Video electronic devices are designed to create not just simple points of light but complete images that you can look at. The most obvious examples are television sets, which can provide hours and hours of entertainment and ask for so little in return — just a few of your brain cells.

Some types of electronic devices work with light that you can’t see. The most common are TV remote controls, which send infrared light to your television set whenever you push a button. (That is, assuming you can find the remote control.) The electronics inside the remote control manipulate the infrared light in a way that sends information from the remote control to the TV, telling it to turn up the volume, change channels, or turn off the power. (You learn how to work with infrared devices in Book 4, Chapter 4.)