Learners view an animated explanation of why an adjustment of the output voltage by an AC drive is required to maintain a constant torque as the frequency is varied.

In this animated and interactive object, learners examine why the voltage produced by an AC drive must be increased when its frequency is increased due to inductive reactance.

Learners use peripheral vascular assessment data to examine characteristics of these four conditions: peripheral arterial disease, deep vein thrombosis, chronic venous insufficiency, and acute arterial occlusion. A matching exercise completes the learning object.

Explore the different types of personal protective equipment, which protects you against workplace hazards

In this learning activity you'll review information and exercises from the planning part of the "Personal Savings/Spending Plan for Adults" learning object.

In this learning activity you'll complete exercises using personal pronouns as subjects or objects.

In this learning activity you'll complete your own budget to understand the concept of needs and wants relating to building a personal budget.

Read about the difference between the subject and object form of personal pronouns and test your knowledge in practice exercises.

In this learning activity you'll complete exercises using personal pronouns as subjects or objects.

In this learning activity you'll view a library of figures demonstrating various concepts in visual perception.

Learners examine the method used to calculate the mass percent of an element in a compound. Three examples and one problem illustrate the method.

Learn the definition of perception, its process and how it affects communication

In this learning activity you'll complete exercises matching possessive pronouns and antecedents.

In this learning activity you'll review the basics of budgeting, income, and spending. Using an on-line form, you can create your own monthly budgets and a pie chart of your spending habits.

In this learning activity you'll complete exercises matching possessive pronouns and antecedents.

In this learning activity you'll reflect on possible behavior choices and their impact on communication.

In this screencast you'll define how perception influences your world view and learn the elements of the perception process.

In this screencast, students read about the basic organization and structure of the periodic table of elements. Students identify elements as belonging to a group, a period, or neither.

Students perform conversions among fractions, decimals, and percentages in this assessment.

Students practice identifying common elements from the periodic table by name or symbol.