The student reviews definitions of it's/its and completes a practice exercise.

In this animated object, learners view hydrogen and hydroxide ions in a solution. A brief quiz on the basic principles of the term pH completes the activity.

Students read about South Africa and the countries that surround it. They test their knowledge in a map exercise.

In this video, you’ll explore the engine lathe, its basic components, and you’ll learn to operate its machine controls.

The learner reads a brief explanation of how to use Mandarin Chinese monetary terms in formal and colloquial speech. The learner can then click on a term to listen to its pronunciation and see its value.

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.

Explore how a goldfinch interacts with its environment and how it's affected by environmental changes.

In this learning activity you'll explore Kirchhoff's Current Law and view examples of its application.

In this animated activity, learners examine how an adjustable pressure-reducing valve can produce a pressure that is lower at its output than at its input.

In this interactive object, learners adjust the caster of a vehicle to control its directional stability.

In this learning activity you'll explore units of measurement.

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

Students solve five problems to determine the total impedance of a series-parallel circuit. Immediate feedback is given.

In this interactive and animated object, learners examine how dc voltages develop across capacitors that are connected in series and in parallel.

The purpose of the conveyor and how it accomplishes its objective.

The learner will gain an understanding of the inner workings of the cycloidal gear drive while watching a video and listening to an explanation of its features.

The learner views animation showing how a DC motor is wired and its operational characteristics. A short quiz completes the activity.

Learners examine how the National Debt occurs and trace its history from the time of the Revolutionary War through the present.

Learners will understand the technical terms used in the context of the SDS to help them interpret its information.

In this animated and interactive object, learners examine why the voltage produced by an AC drive must be increased when its frequency is increased due to inductive reactance.