Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).

In this interactive object, the learner practices identifying charges on ions.

In this learning activity you'll observe the growth of gram negative organisms and determine if they're lactose positive or negative.

Students read the terms associated with the Bipolar Junction Transistor (BJT) . They also view formulas for dc current and voltage.

Explore how to prevent injuries caused by falling from ladders or elevated heights by looking at the parts of a ladder, ladder safety rules, and personal fall protection systems.

In this animated and interactive object, the learner uses a Casio fx-260 calculator to solve for the magnitude of the resultant and of one of the component forces in a right triangle.

In this learning activity you'll analyze the impact of various factors in their lives. They are then transformed by a new identity. They analyze the potential impact of this new identity and compare it to their initial lives.

Learners examine the counter-reset function of a programmable controller and how it is used.

In this learning activity you'll demonstrate how to use unity fractions to complete conversion calculations.

In this learning activity you'll read about Robert Maddux's conflict model and then apply what you've learned to an interactive exercise.

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 be introduced to soft skills, or people skills, needed by all IT professionals.

In this animated object, learners examine the chemistry behind table salt.

In this interactive object, learners examine how hydraulic oil is contaminated, the types of damage contamination can cause, and the methods used to clean the oil.

In this learning activity you'll write a technical description of a staple remover.

In this learning activity you'll write about your attributes and analyze their perception of their abilities, roles, personality, beliefs, and goals.

The student is shown and then identifies the parts of a hydraulic shear.

In this interactive object, learners vary the value of the resistance to see how it affects current. Example problems are included.

Learners follow the path of a carbohydrate food from consumption through digestion to absorption into the bloodstream. In a matching exercise, students identify the main type of carbohydrate found in four different foods.

The student takes a quiz on identification and operations of an engine lathe.