The Electrical Generator
In this multi-part simulation, the student generates current and lights a bulb in a variety of different ways: using a movable bar magnet, using an electromagnet and transformer, and using a very simple hydroelectric generator. The simulation provides a good visualization of the production of alternating current. Lesson plans are also available for the teacher on this site. Electromagnetic induction involves changing magnetic flux to induce an electric current. Students have trouble visualizing this, since magnetic fields and electric current are both invisible to them. Through this engaging set of simulated activities, the student can draw the connection that it is not the magnetic field per se, but changes in the magnetic field in the vicinity of a coil that produce current. That electricity and magnetism are tightly coupled become more readily apparent when exploring their interactions through this simulation.
