In this animated lesson, students read an analogy comparing water in a "special" water tank to the current "flow" through a capacitor.
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.
Learners work problems to make conversions between RMS, average, peak, and peak-to-peak AC voltages.
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.
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.
This learning activity describes the physical properties that affect the inductance, in henries, of an inductor.
Learners read about the concepts of true power, reactive power, and apparent power, and are introduced to the power factor formula. A short quiz completes the activity.
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.
In this animated activity, learners examine the conversion of electrical energy into an electrostatic charge within the dielectric material of a capacitor.
Students read an explanation of reactive power in a power distribution system involving motors, generators and transformers. A brief quiz completes the activity.
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.
Learners consider why an impedance matching transformer is needed to connect an antenna to a television.
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.
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.
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.
In this animated lesson, learners examine sine waves and alternating current. A brief quiz completes the object.
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.
In this interactive object, learners examine the physical facets that determine the value of a capacitor. A brief quiz completes the activity.
Learners view animations and video clips showing how power is transmitted from one energized coil to another.
Learners read a description of how an oscilloscope is used to measure the frequency of a sine wave.
In this interactive and animated object, learners examine how dc voltages develop across capacitors that are connected in series and in parallel.
Using text and graphics, this learning activity describes a sine wave, including alternations, cycles, time, amplitude, and degrees
In this animated object, learners examine how a coil of wire provides more resistance to AC current flow than an uncoiled wire. This learning object contains audio.
Students read descriptions of the voltage, current, and turns ratios of the primary and secondary coils for a transformer in this interactive lesson.
Students read about the concept of true power and view examples of how it is dissipated as heat is provided.