In this animated and interactive object, learners use a color code to understand the operations of a hydraulic circuit. A brief quiz completes the activity.

In this animated object, students examine the role that the solubility of water plays in various biological functions.

In this interactive object, learners follow the steps required for the Ziegler-Nichols Continuous Cycling method. The process identification procedure is performed, calculations are made, and the proper PID values are programmed into the controller.

Learners perform the steps required for the Ziegler-Nichols Reaction Curve Tuning Method. The process identification procedure is performed, calculations are made, and the proper PID values are programmed into the controller.

Learners read a passage and answer two questions based on the information found it that passage. Immediate feedback is provided.

Students read how profits can be doubled with the elimination of only a fraction of the "waste" in a company's operation.

Learners read a description of inductors and view examples of inductors in series and in parallel.

Learners solve two sample problems for a numerical reasoning assessment.

Learners solve two sample problems for an abstract reasoning assessment.

Learners choose the meaning of a selected word in a sentence.

Learners solve two sample problems for a mechanical reasoning assessment.

Learners mentally manipulate two-dimensional diagrams to visualize the objects in their three-dimensional forms.

Learners examine how the boiling point increases with increasing pressure. An example from industry is given.

In this animated object, learners examine the formation of ester bonds in the synthesis of lipids using triglyceride biosynthesis as an example. Ester bond formation is described as a dehydration synthesis reaction.

Students read an introduction to the transconductance amplifier. They also view formulas for voltage-to-current conversion, closed-loop input, and output impedance. An example of how R1 controls the conversion factor is given.

The current-to-voltage conversion of the transresistance amplifier is examined. The formulas for output voltage and impedance are defined and an example ties the concepts together.

Students view an example of how to convert rotational velocity to linear velocity. They then work practice problems.

Users view effective and ineffective methods of assessing a task. Flight training is used as an example of an area that needs authentic assessment.

In this animated object, learners follow the steps for solving word problems using algebra. An introductory example is explained.

Boyle's Law states that gas volume varies inversely with the pressure at constant temperature and is described by the equation PV = constant. An example of a sample of gas at two conditions of P and V is used to illustrate the law.