Motor

Schematic Symbol	Actual Image

This is the schematic symbol for a motor. Small electric motors tend to go one direction when hooked up one way, and the other direction when hooked up the opposite way. For this reason, they are considered polarized. A small electric motor should work no matter which way you hook it up, and you may have to experiment to get the direction the way that you want it. Pictured is what is commonly called a "hobby motor". Hobby motors are small and cheap, and can usually be run off of very small batteries or even solar cells.

Buzzer

Schematic Symbol	Actual Image

Here is what the schematic for a buzzer looks like. You can get small, mechanical buzzers at many electronics stores. They frequently are polarized and will not make any sound when hooked up in reverse. Notice that the buzzer pictured has a red and a black wire. The red wire is positive (or V+), and the black wire is negative (or GND). This kind of buzzer makes a very loud whine when hooked up to any battery between +3 and +12 volts. It can be heard for probably half a mile.