In this learning activity you'll review the safety equipment used to protect a worker's face and ears.

In this animated activity, learners read an explanation of the four different modalities (currents) used in electrotherapy.

Learners examine pictorial drawings used in engineering including sectioned and exploded drawings. A sketching quiz is provided to help the learner create simple pictorial sketches by using orthographic views and an isometric template.

The superposition theorem is explained as it relates to dc circuit analysis. Examples are given.

Learners study the operation and characteristics of an incremental optical encoder used in automated manufacturing applications. A brief quiz completes the activity.

Learners examine the two methods used by programmable logic controllers to perform a counting operation using addition or counter instructions. A brief quiz completes the activity.

In this learning activity you'll review the operation and schematic symbols of various types of switches and push buttons used for electronic circuits.

This interactive object is designed to help learners memorize schematic symbols used in hydraulic diagrams. Learners quiz themselves using electronic flashcards.

Learners follow the steps for reducing all of the elements of a complex circuit to a single current source and a single source resistance to create a simple circuit. Several examples are given for dc circuits. The conversion between Thevenin and Norton is also presented.

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.

The student sees a list of 30 of the most often misspelled words used in business. In one exercise, the student listens to each word and then keys in the spelling of that word. In the next exercise, the student matches synonyms.

Learners examine the formulas that are used to determine the proper PID values to be entered into a controller using the Ziegler-Nichols Continuous Cycling Tuning Method.

Learners study an animated block diagram that describes the function of each element in a closed-loop system used in industrial automation.

In this animated object, learners examine the operation of a temperature alarm circuit that uses a thermistor in a Wheatstone Bridge.

Students read about the six theoretical perspectives used to explore psychological events and do an interactive exercise.