Learners examine the fundamentals of a pulse train. Concepts such as time on, time off, duty cycle, period, and frequency are covered.

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.

Students view the design and function of an ac model for a transistor circuit.

In this interactive object, students complete progressively more difficult exercises as a way to improve their ability to recognize resistor color code values.

Learners read how to calculate the MOD number and how it is used.

In this animated activity, learners study the principle behind an inductor producing a high momentary voltage while its magnetic field collapses. A short quiz concludes the lesson.

In this animated activity, learners examine the operation of the SCR, including how it is biased and how it is turned off. A brief quiz completes the object.

Learners examine the wiring of the primary components of the three types of DC motors, series, shunt, and compound. The operational characteristics of each type of motor are described. A quiz completes the activity.

The learner views the operation of a transistor switching from saturation to cutoff. A brief quiz completes the activity.

Learners examine the concept of the RC time constant. The instantaneous voltage across the capacitor is calculated.

Students read an explanation of "superposition" as a technique for ac circuit analysis. Complex numbers are used.

Learners read how an inductor opposes a current change when it begins to energize and when it begins to de-energize. A short quiz completes the activity.

In this animated object, students examine the steps for wiring an electrical circuit from reading a schematic diagram.

Learners examine a series-parallel circuit and solve 14 problems related to voltage, current and power. A help screen is provided.

Students read an introduction to the transconductance amplifier. They also view formulas for voltage-to-current conversion, closed-loop input, and output impedance. An example of how R1 controls the conversion factor is given.

This primer introduces the student to the half-wave rectifier. Both the 1st and 2nd approximations are examined.

Students read descriptions of the voltage, current, and turns ratios of the primary and secondary coils for a transformer in this interactive lesson.

Students work practice problems in which the total resistance of the circuit is calculated. Feedback is provided.

Students read a definition of Kirchhoff's Voltage Law and view examples of its use.

Learners examine the use of the reciprocal key on the TI-83 Plus calculator to determine parallel resistance.

In this animated object, students examine the concept of wattage dissipation and the three Watt's Law formulas.

The inverting amplifier configuration is presented. The closed loop voltage gain and the closed loop bandwidth formulas are explained, along with the concept of negative feedback.

In this animated and interactive object, learners examine why the voltage produced by an AC drive must be increased when its frequency is increased due to inductive reactance.

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 read about the ideal versions of the four common filters (low-pass, high-pass, bandpass, and notch), and view graphical representations of the filters' frequency characteristics.