DC Current Flow Through a Parallel Circuit
By Terry Bartelt
Learners observe current flow throughout the series portion and branches of a parallel circuit. This animated activity includes calculations and a short quiz.
DC/AC I: Unit 10 Sample Exam
By Patrick Hoppe
Learners answer eight questions about capacitors. Help pages are available.
DC/AC I: Unit 11 Sample Exam
Learners answer six questions about transformers.
DC/AC I: Unit 12 Sample Exam
A sample exam for DC/AC I, unit # 12 is presented to the students. This unit covers transformers.
DC/AC I: Unit 2 Sample Exam
In this interactive object, learners work 10 problems covering resistors, voltage, and current.
DC/AC I: Unit 3 Sample Exam
In this interactive object, students answer 10 questions covering Ohm's Law and Power Law.
DC/AC I: Unit 4 Sample Exam
In this interactive object, learners answer nine questions about series and parallel circuits. Immediate feedback is provided.
DC/AC I: Unit 5 Sample Exam
Learners answer 14 questions about series-parallel DC circuits.
DC/AC I: Unit 8 Sample Exam
Students answer five questions concerning magnetism.
DC/AC I: Unit 9 Sample Exam
In this interactive object, learners answer nine questions about inductors.
DC/AC: Unit 1 Sample Exam
In this interactive object, learners work 11 problems covering atomic structure, conductors, and insulators.
De-Energizing Time Constants of an RL Circuit
In this animated learning object, students examine current, voltage, and the magnetic field strength of a series RL circuit while it is de-energizing during five time constants. A quiz completes the activity.
Derivative Control Mode Analogy (Screencast)
In this animated object, learners view a race of two boats as an example of how the derivative function of a PID controller shortens the time duration of an operation.
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
By Terry Bartelt, Terry Fleischman
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.
Designing a Reciprocation Circuit
This animated lesson an exercise that enables students to design a ladder logic circuit using a drag-drop function to cause the cylinder of a hydraulic circuit to extend and retract.
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.
Dielectric Constant
This learning activity presents information on how the type of material used for the dielectric of a capacitor affects the capacitor's value in farads.
Difference Op Amp
Learners examine the fundamental operation of a difference operational amplifier. A brief quiz completes the activity.
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.