Here are some very good sites to help you study for the Ag Mechanics Competition

(Click on Title)

Ohms Law Curriculum

Voltage, Current, Resistance, and Ohm’s Law  

Volts, Watts, etc. Explained Video

Electrical Safety Curriculum

Agricultural Mechanics Tool ID Manual

Basic Woodworking Text

Wiring a Single Pole Switch

Wiring a Duplex Receptacles