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 highly interactive and animated object, learners examine the VAT-40 battery starting and charging system tester and study how the tester is used to diagnose vehicle starting system problems. This object has audio.

Students determine what happens to current flow in a series circuit when the resistance is changed. A brief quiz concludes the activity.

Learners read about the different kinds of positions available in the accounting field at private corporations, government agencies, and not-for-profit organizations.

In this animated object, learners examine automated manufacturing systems classified as motion control, batch process control, and continuous process control.

In this learning activity you'll solve systems of two linear equations in two unknowns by determinants.

In this screencast of an old Flash learning object, learners follow along as we sort parasites into divisions and helminth divisions. We'll also identify affected body systems.

Explore how to prevent injuries caused by falling from ladders or elevated heights by looking at the parts of a ladder, ladder safety rules, and personal fall protection systems.

In this animated object, learners examine the operation of two-way, three-way, and four-way directional control valves used in pneumatic systems.

Learners examine the differences and similarities between hydraulic and pneumatic systems.

Learners examine the operation of positive and non-positive displacement compressors used in pneumatic systems.

Learners review normal conditions that are associated with aging. Changes are highlighted in the cardiovascular, musculoskeletal, respiratory, gastrointestinal, urinary, reproductive, endocrine, nervous, and sensory systems.

In this animated learning object, learners examine the regulation of inducible operons in bacterial systems.

Learners examine animations of the most common transmission signals used in automated systems, such as 4 mA to 20 mA, 3 psi to 15 psi, and 0 to 10 volts. A brief quiz completes the activity.

Learners examine the basic types of dimensioning including unidirectional and aligned systems, and linear, aligned, angled, arrowless, chain, datum, chart, tabular, radius, diameter, typical, and reference dimensions.

Students answer 10 questions in a sample exam. This exercise covers number systems, number conversion, logic gates, and combinational design. Feedback is provided.

Learners view the conversion factors within and between the metric, apothecary, and household systems. A quiz completes the activity.

In this animated object, learners examine how psychotropic medications act on neurotransmitter systems to achieve their desired effect.

Students read about the Federal Reserve System's structure and goals and the tools it uses to control the flow of money and credit in the economy. At the end of this activity, learners are asked to write how they would solve specific economic problems if they served on the Fed's Board of Governors.

Learners quiz themselves on the conversion factors within and between the metric, apothecary, and household systems.