Learners read this review of chemical hair bonds after completing learning objects on the peptide, disulfide, salt, and hydrogen bonds. Students may e-mail their quiz answers to their instructor.

The student reviews definitions of then/than and completes a practice exercise.

In this object designed for instructional assistants, learners read about the laws that pertain to student school records. Three case studies are presented and learners write about how they would respond in these situations.

In this animated object, students view an explanation of how current, voltage, and the charge on a capacitor of a series RC circuit change during five time constants. A short quiz completes the activity.

Learners follow steps to convert numbers from Gray code to binary code. They then view steps to change binary values to Gray code numbers.

Learners compare animations of analog and digital data signals. A short quiz completes the activity.

Learners calculate the total cost of a loan by entering the principal amount, the period of the loan, and the annual percentage rate.

Students read an explanation of chemical formulas in this animated activity. A quiz completes the object.

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

In this learning activity you'll review the steps for calibrating the length of depth micrometer measuring rods.

Students read about five countries in Southern Africa and locate them on a map.

Learners will examine how cardiac markers are used in the diagnosis of cardiac disease.

The learner reviews steps in analyzing a process and applies them to a situation in his/her own work or personal life.

In this interactive object, learners read a brief summary of the principles of cash basis accounting and then check their knowledge of transactions in a drag-and-drop exercise.

Learners study the method of cascading two or more PLC timers to extend their time capacity.

Explore how to collect a fresh or dry blood specimen and prepare it for the crime lab.

In this highly interactive and animated object, learners complete three exercises to identify the cranial nerves and their functions.

Learners observe how to cascade PLC counters to extend the maximum count of one counter.

In this learning activity you'll explore how a fuse de-energizes a parallel circuit when too many lamps are connected to a power outlet.

In this screencast, learners examine the kinds of physical and chemical changes that occur in substances.