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A diode is a device that lets current flow in only one direction. Figure 3-17 shows an assortment of various types of diodes.

FIGURE 3-17: An assortment of diodes.

A diode has two terminals, called the anode and the cathode. Current will flow through the diode only when positive voltage is applied to the anode and negative voltage to the cathode. If these voltages are reversed, current will not flow.

You learn all about diodes in Book 2, Chapter 5. For now, I suggest you get at least five of the basic diodes known as the 1N4001 (the middle one in Figure 3-17). You should be able to find these at any electronics parts distributor.