In this interactive and animated object, learners examine the flow of electron current into and out of hot and neutral sockets during each alternation of an AC waveform. A brief quiz completes the activity.

Accounting Careers and Titles: Areas of Specialization

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 learning activity you'll discover the disconnected nature of the HTTP request-response model including some methods of persisting state and the security implications.

In this animated activity, learners examine the circuitry in a DC variable speed drive that causes the motor to accelerate or decelerate at slow rates. This learning object has audio content.

Learners view several movie clips that demonstrate the use of an indicator to follow the neutralization reaction that occurs when an acid and a base are mixed. Students test their knowledge in a series of questions. Immediate feedback is given.

Complex Power: The Sum of the Individual Real and Reactive Powers

The learner views a method to find the total complex power of a circuit in which the individual real and reactive powers are found and then added together. Several examples are shown, along with the power triangles.

In this animated learning object, students view the operation of an oscilloscope that is used to measure AC voltages. A brief quiz completes the activity.

The Mathematical Expression of an AC Sine Wave As a Function of Time: Practice Problems

Students view the mathematical expression of a sinusoidal waveform with respect to time (t) and solve five problems. The answers are provided so students may check their work.

In this animated object, learners study the rotation of the magnetic stator field of an AC motor and how it interacts with the armature to cause rotation. A short quiz completes the activity.

Learners study the factors that determine the frequency of an AC generator, such as the rotational speed of the armature or the number of stator poles.