In this interactive object, students calculate capacitive reactance, phase angle, impedance, and power in series RC circuits.

Learners examine first and second approximations and view examples of a "stiff" current source.

Students view drawings of the dc analysis of a voltage-divider biased NPN transistor.

In this animated object, learners examine an analog closed-loop feedback system that uses potentiometers to control the position of a gear rack.

Learners identify the parts of speech by following a certain order until each word in a sentence is labeled. In a variety of exercises, learners practice finding verbs, prepositional phrases, subjects, nouns, pronouns, adjectives, adverbs, and conjunctions.

In this learning activity you'll identify the various parts of a bar graph, read and interpret its data, and calculate the data to solve various application problems.

Learners read the definitions of working capital, current ratio, quick ratio, return on equity, accounts receivable turnover, and inventory turnover.

In this interactive object, learners read a brief summary of the principles of cash basis accounting and then check their knowledge of transactions in a drag-and-drop exercise.

Learners follow step-by-step instructions for using an oscilloscope to measure DC voltages.