AC Capacitor: A Water Tank Analogy

By Roger Brown

In this animated lesson, students read an analogy comparing water in a "special" water tank to the current "flow" through a capacitor.

AC Current Flow

By Terry Bartelt

In this interactive and animated object, learners examine the flow of electron current into and out of hot and neutral sockets during each alternation of an AC waveform. A brief quiz completes the activity.

AC Voltage Conversion Problems

By John Rosz, Terry Bartelt

Learners work problems to make conversions between RMS, average, peak, and peak-to-peak AC voltages.

The Electrostatic Charge of a Capacitor

In this animated activity, learners examine the conversion of electrical energy into an electrostatic charge within the dielectric material of a capacitor.

AC Voltage Conversions

In this animated object, learners examine the formulas used to convert peak, RMS, average, and peak-to-peak AC voltages. A brief quiz completes the activity.

The Generation of Alternating Current

This learning object describes the production of an alternating current in a generator with a single-loop armature. An illustration of how a sine wave is produced is shown through animation.

Apparent Power

Learners read an explanation of the concept of apparent power in a power distribution system involving motors, generators, and transformers. A quiz completes this interactive lesson.

The Edison Wire System

Learners read a description of the wiring configuration of a residential Edison Wire System, which consists of a transformer secondary circuit. The circuit supplies two 115-volt sources and one 230-volt source.

Transformer Practice Problems

By Patrick Hoppe

Students solve practice problems on voltage, current, and impedance matching. Examples precede the problems.

Inductance

This learning activity describes the physical properties that affect the inductance, in henries, of an inductor.

Voltages Across Series and Parallel Capacitive Circuits

In this interactive and animated object, learners examine how dc voltages develop across capacitors that are connected in series and in parallel.

Transformer Loading

In this animated activity, learners see that changing the resistance value of the load in the secondary of a transformer causes current to vary in the primary.

Reactive Power

Students read an explanation of reactive power in a power distribution system involving motors, generators and transformers. A brief quiz completes the activity.

Motor Loading

Students view a graphical explanation of how the motor condition (unloaded, 50 percent loaded, fully loaded) affects the phase between voltage and current, the current draw from the AC supply, the amount of power consumed, and the power factor.

Oscilloscope AC Voltage Measurements

In this animated learning object, students view the operation of an oscilloscope that is used to measure AC voltages. A brief quiz completes the activity.

Oscilloscope Phase Shift Measurements

In this animated lesson, learners follow the steps required to read the phase shift difference in degrees between two AC waveforms.

An Impedance Matching Application

Learners consider why an impedance matching transformer is needed to connect an antenna to a television.

The Vertical Portion of the Sine Wave

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

Phase Relationships Between Line-Neutral and Line-Line Voltages

By Michael Gradinjan, Terry Fleischman

Learners view a demonstration showing that line-neutral voltages and line-line voltages are not in-phase with each other, but have a definite 30-degree relationship.

Capacitor Values

In this interactive object, learners examine the physical facets that determine the value of a capacitor. A brief quiz completes the activity.

Capacitive Reactance Practice Problems

Students solve problems on the determination of total capacitive reactance of series-parallel capacitors.

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.

The Transfer Function and Frequency Response of a Low Pass Filter

Students learn how to predict how circuits will respond to varying frequency. They solve for the magnitude and phase angles.

Op Amps 1: The Operational Amplifier

By Todd Van De Hey

The learner will examine the basic characteristics of the operational amplifier integrated circuit and solve for Vout.

The Torque of an Induction Motor

By Terry Fleischman

The learner will examine how torque is developed in an induction motor.