Current Divider Rule (CDR)

By Patrick Hoppe

Students review the Current Divider Rule (CDR) and work practice problems.

Current in a Series Circuit

By Terry Bartelt

In this learning activity you'll determine what happens to current flow in a series circuit when the resistance is changed.

Current Source Approximations

Learners examine first and second approximations and view examples of a "stiff" current source.

Data Compare Instructions

In this animated object, learners examine three data compare instructions used by programmable logic controllers (PLCs). A practical application to show how these instructions are used in an industrial setting is provided.

Data Conversion

Learners observe animations showing how data is converted between serial and parallel flow.

DC Circuit Analysis: The Series Circuit

Learners examine a general approach to solving for the current through, the voltage across, and the power dissipated by each resistor in a series DC circuit. A three-resistor series circuit is used as an example.

DC Compound Motors

Learners study animation showing the operation of cumulative and differential DC compound motors. A short quiz completes the activity.

DC Current Flow Through a Parallel Circuit

Learners observe current flow throughout the series portion and branches of a parallel circuit. This animated activity includes calculations and a short quiz.

Deriving the Formulas of the Power Wheel

By Ron Wallberg

Use Ohm's law, Watt's law, and the power equation to derive formulas for the DC power wheel.

Designing a Cylinder Dwell Circuit

This animated lesson shows how a ladder circuit uses timer-on delays to cause an extrusion machine to operate.

Designing a Ladder Diagram

In this animated object, learners examine the design of a ladder circuit that provides manual control to a water pumping system. Students also study modifications to the circuit as the complexity of the system increases.

By Terry Bartelt, Terry Fleischman

Determining Hydraulic Cylinder Size

Students read how to calculate the size of a hydraulic cylinder that is required for a particular application. Mathematical formulas are provided.

Digital Position Control

In this animated object, learners examine a closed-loop feedback system that uses digital circuits to control the position of a gear rack.

Digital Terrain Model (DTM): Determining Contour Location

By Steve Whitmoyer

Learners read how to determine the location of a contour for a specific location given a TIN.

Digital Terrain Model: Extrapolation of Elevations

Students read how to determine the elevation of an alignment or cross section where it crosses the TIN.

Digital Thermometers

Learners examine the electronic components of a digital thermometer.

Digital-to-Analog Converters

In this animated activity, learners examine how an electronic converter changes digital signals to analog signals. Sections of a synthesizer are identified, and the operation of a D/A converter is demonstrated.

Direct-Operated, Pressure-Reducing Valves

By Terry Bartelt, Doyle Davis

In this animated activity, learners examine how an adjustable pressure-reducing valve can produce a pressure that is lower at its output than at its input.

Discharging Time Constants of an RC Circuit (Screencast)

In this animated object, learners examine how current, voltage and the discharging capacitor of a series RC changes during 5 time constants. A brief quiz completes the activity.

Displacement and Velocity Ratios

By James Bourassa, John Rosz

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

Dynamic Braking Circuits

In this animated activity, learners examine the operation of a dynamic braking circuit used to quickly stop a motor.

Effects of a Rheostat in a Series Circuit

In this animated object, learners examine how the way in which a rheostat is connected in series with other resistors causes current and voltage to change as the resistance is varied. A brief quiz completes the activity.

Effects of a Rheostat in a Series-Parallel Circuit

Learners examine the current and voltage changes in a series-parallel circuit as the resistance value of a rheostat is varied. Illustrations and calculations are included.

Electrical Generator Basics

In this animated activity, learners examine how a voltage is induced into a conductor when the conductor cuts across magnetic flux lines. They also view the four factors that determine how much voltage is generated. A brief quiz completes the learning object.