Learners examine the operation of the on-off control mode using a home heating example. A short quiz completes the activity.

Learners examine an animated view of the operation and programming requirements of a PLC Examine-On instruction. A brief quiz completes the activity.

In this interactive object, learners view a practical application of a PLC Timer-On function.

Learners read the definitions of the prepositions "in," "on," and "at" and view examples of how these words are used. They then complete an exercise by inserting the prepositions into sentences.

Learners view an animation showing the one-shot operation of a programmable logic controller.

In this interactive object, learners change the amount of money received from tax revenue and the amount spent on federal programs as they calculate how fiscal policy affects the gross domestic product (GDP), unemployment, inflation, the annual deficit, the national debt, and interest on the national debt.

Learners read the definitions of working capital, current ratio, quick ratio, return on equity, accounts receivable turnover, and inventory turnover.

Learners examine how visual controls help to manage the workplace. Photos of visual controls are provided.

Learners examine the animated Timer-On Delay instruction and the Timer-Off Delay instruction of a PLC timer. A brief quiz completes the activity.

Students listen to three telephone messages and enter their evaluation of each one. They then read a list of guidelines for leaving effective messages.

In this learning activity you'll be introduced to the communication model and how it impacts your work as an IT professional.

Students examine an Excel spreadsheet to determine range, class, and width.

In this interactive object, learners examine standard and metric thread specifications used in engineering drawings. In a brief quiz, they identify various internal and external thread representations.

This learning object describes the equipment and supplies needed to document bloodstain patterns.

In this interactive object, students explore the basic elements and common terms associated with dimensions and leaders. A quiz completes the activity.

Learners view practical examples of how a Hall-effect sensor is used.

In this interactive object, learners consider three situations involving patient care. They then decide what legal principles are involved.

In this animated object, learners examine how changes in pH affect the salt bonds in strands of hair.

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 student reviews definitions of their/there/they're and completes a practice exercise. The print and email function at the end has been disabled.