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.

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 lesson provides a drawing with steps to complete the activity.

Learners read about the vector diagram for a parallel RL circuit. This animated lesson presents information on current flow through each branch, total current, and phase angle.

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

This lesson gives the student an overview of grinding wheels and pedestal grinder procedures.

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.

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

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.

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

This animated lesson shows how to calculate the amount of force generated by hydraulic cylinders.

In this animated lesson, learners follow the steps required to read the phase shift difference in degrees between two AC waveforms.

At the end of this lesson you will be able to

- Explain what biosecurity means.

- Describe why biosecurity is important.

- Identify what kinds of disease agents we try to prevent or control with biosecurity.

- Demonstrate disease agent-host-environmental interactions that result in disease.

In this animated activity, students view how the Wheatstone bridge is used to activate a temperature alarm. A short quiz completes 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 and interactive lesson, learners examine additive and subtractive color theories.

This lesson focuses on the affective domain, which refers to attitudes of awareness, interest, attention, concern and responsibility. Users quiz themselves on their basic understanding of the content.

Learners read a step-by-step approach on how to connect an ohmmeter when making measurements in this interactive lesson.