In this animated activity, learners study the principle behind an inductor producing a high momentary voltage while its magnetic field collapses. A short quiz concludes the lesson.

In this animated object, learners examine how a gateway server operates.

Users of this learning object evaluate the early online experiences of four hypothetical students and record the lessons that can be learned about what to do and what not to do to create effective online learning environments.

In this animated activity, students view how the Wheatstone bridge is used to activate a temperature alarm. A short quiz completes the lesson.

This animated lesson shows several ways that a hydraulic pressure switch, connected in a ladder circuit, causes the cylinder of a hydraulic circuit to perform various applications.

This animated lesson shows how a pressure switch connected in a ladder circuit causes the cylinder of a hydraulic circuit to extend and retract.

This animated lesson shows how a ladder circuit causes the cylinder of a hydraulic circuit to continuously extend and retract after a Start button has been pressed.

Students match images of insects and other pests with their descriptions in this lesson on keeping a food service operation free from contamination.

In this interactive lesson, learners study the use of "many" and "much" with nouns that can be counted and nouns that cannot. They then practice using these words in a drag-and-drop exercise.

This animated lesson an exercise that enables students to design a ladder logic circuit using a drag-drop function to cause the cylinder of a hydraulic circuit to extend and retract.

The student identifies the anatomical parts of the ear and learns the purpose and function of these parts. A review follows the lesson.

In this animated lesson, learners examine sine waves and alternating current. A brief quiz completes the object.

In this animated activity, students view a step-by-step approach for how to connect an ammeter to a circuit. A brief quiz concludes the lesson.

In this animated activity, learners examine how the speed of a motor may change if the voltage from the power source fluctuates due to power line irregularities. This lesson has audio content.

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

This animated lesson shows how a photoelectric sensor, connected to a ladder circuit, causes the cylinder of a hydraulic circuit to extend and retract.

This lesson provides a drawing with steps to complete the activity.

In this animated activity, learners view the flip-flop and read about its outputs, the information it stores, and its storage conditions. A quiz completes the lesson.

Learners assess the periodontal status and the health risk factors of a fictitious patient. They also make treatment recommendations in this interactive lesson.

Students locate the enamel, cementum, cementoenamel junction, the anatomic crown, and the root of a tooth in this interactive lesson.