In this animated activity, learners examine how residual magnetism causes magnetic hysteresis.

In this animated lesson, students view the operation of an electromechanical relay. A brief quiz concludes the activity.

In this interactive lesson, students view the operation of a solenoid and read about its application. A brief assessment concludes the activity.

Learners examine how an electromagnet is formed. Animated illustrations show current running through a coil wrapped around an iron core.