In this interactive and animated object, students distribute the valence electrons in simple covalent molecules with one central atom. Six rules are followed to show the bonding and nonbonding electrons in Lewis dot structures. The process is well illustrated with eight worked examples and two interactive practice problems.

In this learning object you'll review color photographs of a Brown & Sharpe Universal Cylindrical Grinder.

In this learning object you'll explore some frequently asked questions concerning steel rule usage.

This learning object assesses the learner's ability to recall the names and locations of the parts of a drill press. This assessment includes drill press type identification.

In this learning object you'll view a list of ways to keep the area around the machine shop safe.

Using this learning object, students will be able to assess their knowledge of cylindrical grinder components.

In this interactive and animated object, learners examine orthographic projection and the Glass Box Theory. Front, side, and top view development is demonstrated with pictorial views of each object to help develop 2D to 3D visualization skills.

In this animated activity, learners examine the circuitry in a DC variable speed drive that keeps the motor running at a constant speed as the load varies.

In this interactive object, learners work 12 problems dealing with dc circuit analysis.

In this animated activity, learners examine the firing circuits in a DC variable speed drive. The circuits cause the current flow through the armature and rpm to vary. This activity has audio content.

In this interactive object, learners solve a series-parallel DC circuit analysis problem. Immediate step-by-step feedback is given.

In this animated activity, learners examine the circuitry in a DC variable speed drive that causes the motor to accelerate or decelerate at slow rates. This learning object has audio content.

In this screencast of an old Flash learning object, learners follow along as we sort parasites into divisions and helminth divisions. We'll also identify affected body systems.

In this animated object, learners examine water molecules moving through a semipermeable membrane.

In this animated object, learners are introduced to the structure and function of animal cell organelles.

In this interactive object, learners review how to read a caliper. They then test their skills with eight practice questions.

In this animated activity, learners examine the two major phases of cell division: mitosis and cytokinesis.

In this animated and interactive object, learners examine ventilation, external and internal respiration, and gas transport.

In this learning activity, you'll watch an animated explanation of the terms class and object as used by computer programmers, and then contrast the differences.

Students identify the parts of a triple beam balance and practice measuring the mass of objects.