The definition of an isotope is illustrated using the three isotopes of carbon. The three isotopes of hydrogen are discussed as exceptions.

In this learning activity you'll read descriptions of military standards, ANSI, ISO, calibration system standards and audit system reference standards. These topics would be important for the CQT (certified quality technician).

Learners examine the method for calculating the atomic weight of copper from the natural percent composition of each of its two isotopes.

In this learning activity you'll explain how how Usability fits into User Experience Design.

Students read a brief explanation and then complete an exercise writing plurals.

In this interactive object, learners identify the risk factors and the precautions to follow when treating a patient with a cardiac condition. They also design a treatment plan for that patient.

In this interactive object, learners examine the characteristics of osteoarthritis, rheumatoid arthritis, and osteoporosis. Students then describe the precautions to be aware of when working with clients who have arthritis and identify assistive devices that clients might use to prevent injuries at home.

Learners take a close look at the Edison Wire System and observe how the current values through the two lines and the neutral of the system change as the loads vary.

Learners review the differences within the right and left parietal lobes. They answer questions based on a case study and describe a client in a second case study.

Learners review descriptions of 10 personality disorders and then test their knowledge in an interactive softball game.

Learners read a description of the wiring configuration of a residential Edison Wire System, which consists of a transformer secondary circuit. The circuit supplies two 115-volt sources and one 230-volt source.

In this learning activity you'll identify Man-in-the-middle attacks and discuss how they affect network security.

Learners complete a crossword puzzle with terms that relate to common diseases and disorders of the blood. Immediate feedback is provided. Learners have the option to send an e-mail to their instructors notifying them that the learning object has been completed.

Students view diagrams of nails and read the client's nail history. They then determine if the affected nail has a disease or a disorder and recommend salon treatment and home care.

Learners play a game of Tic-Tac-Toe to test their knowledge of non-malignant qualitative and quantitative disorders of white blood cells.

Learners view the waveforms and voltages of an Edison Three-Wire System and read a description of the polarities across the secondary of the center-tap transformer. This transformer supplies power to residential homes.

In this learning activity you'll apply the Pythagorean Theorem to isosceles and equilateral triangles.

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.

In this animated object, learners examine the operation of an optocoupler, specifically how it is connected to external components to provide interfacing and isolation and how it responds to excessive frequencies. A quiz completes the activity.

Learners develop 3D visualization skills by examining front, side, and top orthographic views of objects. Using this information, students select the corresponding isometric view of each object.