The learner will understand the design of a planetary gear drive and its advantages and disadvantages.

In this screencast, learners examine the concept of gear ratios. The number of teeth, diameters, and velocity relationships are discussed and calculated using linear ratio equations.

The learner will gain an understanding of the inner workings of the cycloidal gear drive while watching a video and listening to an explanation of its features.

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.

Learners read an analogy comparing an electrical transformer to mechanical gears.

Students read how to determine and calculate the void ratio for a given sample of soil or aggregate based on the weight-volume relationship.

Learners study the theory of operation for a ratio pyrometer that measures temperature. A short quiz completes the activity.

In this animated object, learners examine the ratio control method used in automation when two or more ingredients are mixed. A brief quiz completes the activity.

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.

The learner will understand the inner workings of the strain wave gear principle.

Learners examine the circuitry in a DC variable speed drive that prevents the motor from running at 0 rpm or at maximum speed under certain conditions.

In this animated object, learners examine formulas for displacement and velocity ratios. They also view examples and calculate velocity and the velocity ratio.

Learners examine the fundamentals of a pulse train. Concepts such as time on, time off, duty cycle, period, and frequency are covered.

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.

Practice how to make research decisions using the 3 Rs.

In this interactive object, learners determine the pulse width, period, duty cycle, and frequency of a waveform.

In this animated object, learners examine what happens to lead and cycle times when the batch size is reduced.

In this interactive object, learners determine the pulse width, period, duty cycle, and frequency of a waveform.

Students follow steps to determine the number of inputs that can be driven by a specific IC. A sample problem is given.

In this interactive object, learners determine the pulse width, period, duty cycle, and frequency of a waveform.