In this animated lesson, the learner examines how a ladder circuit causes the cylinder of a hydraulic circuit to make a single extension and retraction.

Students follow the steps that are required to select a transformer with the proper ratings. Voltage, frequency, current, and KVA are considered.

Learners study the descriptions of the three words in a PLC timer: EN, DN, and TT. They then test their knowledge in a brief quiz.

Learners view an animation showing the one-shot operation of a programmable logic controller.

In this interactive and animated object, learners practice testing a diode. They determine if a diode is good, open, or shorted.

This learning object introduces the three approximations of a diode.

In this animated and interactive object, learners examine the voltages that develop across two series zener diodes, which are connected in opposite directions, when DC and AC voltages are applied across them. A brief quiz completes the activity.

This primer introduces the student to the key terms and concepts associated with the silicon diode.

Learners view the operation of a full-wave rectifier which has two diodes.