The Transistor Symbol

By Terry Bartelt

In this animated and interactive object, learners use a memory device to identify NPN and PNP transistors. Learners also examine how much the transistors turn on when the voltage applied to the base is varied.

The Vertical Portion of the Sine Wave

In this animated lesson, learners examine sine waves and alternating current. A brief quiz completes the object.

The Thevenin Theorem

By Patrick Hoppe

This animated object allows students to examine the four steps used to reduce a complex circuit to a simple series circuit.

Reversing the Rotation of DC Motors

By Terry Bartelt, Terry Fleischman

Learners view animations showing how to change the connections to cause a DC motor to reverse its rotation. A short quiz completes the activity.

Series RC Circuit Vector and Circuit Analyzer

By James Bourassa, John Rosz

In this teaching and learning aid, the user can alter circuit variables and view how these changes affect circuit voltage, current, reactance, impedance, and phase angle.

Energizing Time Constants of an RL Circuit

In this animated object, students view an explanation of how current, voltage, and the magnetic field strength of a series RL circuit change during five time constants. A brief quiz completes the activity.

Series-Parallel Circuit Analysis Practice Problems: Circuit 7

Learners solve 14 problems related to voltage, current and power in a single source, six-resistor circuit. A help screen is provided.

Power Law Practice Problems #3

Learners review the three formulas for power and work 12 problems. In each of the problems, students are given two of the three variables (voltage, resistance, or current) and asked to solve for power. Immediate feedback is provided.

Thevenin Resistance: Practice Problems

Students work five practice problems to determine the Thevenin resistance of DC circuits.

Opens Affecting Current in a Series Circuit

In this learning activity you'll review how an open in a series circuit affects current.

Analog Ohmmeter Operation

Learners follow procedures for measuring resistance using an analog ohmmeter. They examine the use of the Function Switch and the Range Switch and practice reading a non-linear scale. A brief quiz completes the activity.

Logic State Signals

In this learning activity you'll identify the voltage levels produced or recognized by digital logic devices as valid or invalid logic state signals.

The Open-Collector Logic Device

In this animated object, learners view the operation of an open-collector inverter with and without a pull-up resistor.

Transistor Fundamentals: Emitter-Biased NPN Transistor

Students view a dc analysis of an emitter-biased NPN transistor.

Transistor Fundamentals: Decibel Gain, Power, and Voltage

Students read about decibel power gain and decibel voltage gain. Examples are given for each.

Op Amp Fundamentals: The Operational Amplifier

Students read about the characteristics of the ideal operational amplifier and compare them with the industry standard LM741C.

Transistor Fundamentals: AC Models

Students read about the four steps to creating an ac model and view examples.

The Horizontal Portion of the Sine Wave

In this animated object, learners examine cycles, frequency, Hertz, wavelengths, and periods. A brief quiz completes the activity.

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.

Multivibrators

In this animated object, learners examine three different types of multivibrators: astable, monostable, and bistable. A brief quiz completes the activity.

Transistor AC Analysis Practice Problems: Circuit #1

The learner solves for Zin(base), Zin(stage), Zout, and Av. A "help" screen is available.

Internal Elements of a 555 Timer

In this highly interactive object, learners examine the internal elements of a 555 IC and their operation. Learners then test their knowledge in a variety of exercises.

Impedance Matching

Learners examine the impedance matching capability of a transformer and how to select the proper turns ratio to achieve this function. A brief quiz completes the activity.

Transfer Functions: The RL High Pass Filter

Learners read how the RL high pass filter is developed. The transfer function is used in Excel to graph the Vout. The circuit is also simulated in Electronic WorkBench and the resulting Bode plot is compared to the graph from Excel.

The Neutral Current of an Edison Wire System

Learners take a close look at the Edison Wire System and observe how the current values through the two lines and the neutral of the system change as the loads vary.