In this activity, learners use a compass, powerful magnet, and copper magnet wire to build a special generator known as a dynamo. Learners observe what happens to the compass needle when the magnet passes back and forth through the device. Learners can connect the device to a microampere meter to measure the electrical current. This experiment simulates Tesla's electric coil. To provide learners with background about Tesla, this lesson guide suggests learners watch clips from the film "Tesla: Master of Lightning," take an online interactive tour of Tesla's Niagara Power System, and create a diagram of how a dam generates electricity. Use this lesson to demonstrate the Law of Conservation of Energy.