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

Learners study the effect of reflected and transmitted energy on the measurement of emitted energy by a non-blackbody. A short quiz completes the activity.

In this learning activity you'll explore how to reduce electromagnetic interference (EMI) and crosstalk between adjacent wires.

Learners read about lab equipment and basic safety measures. In a quiz, they view photos and determine if the lab technicians pictured are using safe practices.

In this interactive object, learners examine the PN sections of a diode and the diode's forward- and reverse-biased operations. A brief quiz completes the activity.

In this animated and interactive object, learners examine kinetic and potential energy as well as the first law of thermodynamics and the flow of energy between a system and its surroundings. Students also answer questions about exothermic and endothermic reactions

Students read about light-emitting diodes, including LED voltage and current, and how to protect against reverse voltage.

Learners read this review of chemical hair bonds after completing learning objects on the peptide, disulfide, salt, and hydrogen bonds. Students may e-mail their quiz answers to their instructor.

In this interactive object, learners determine the limiting reagent and the excess reagent in chemical reactions. Learners test their knowledge by solving three problems.

Students read about the concepts of saturation and cutoff. They view diagrams that illustrate the interaction of the load line and the family of curves.

Learners use the coefficients in a balanced equation to develop the mole ratios of reactants and products involved in the reaction. Five interactive examples illustrate the method, and students test their knowledge by working four problems.

In this animated and interactive object, learners calculate the area and centroid of a semicircle.

In this animated object, learners examine synthesis, decomposition, exchange, and reversible reactions.

In this animated and interactive object, learners examine how blood flows through the heart and lungs. A brief quiz completes the activity.

Learners examine the meaning of theoretical yield, actual yield, and percent yield. They test their knowledge by solving two problems.

Students read an explanation of chemical formulas in this animated activity. A quiz completes the object.

In this screencast, learners examine the kinds of physical and chemical changes that occur in substances.

Students view drawings of the emitter resistor bypass capacitor.

Learners analyze an emitter-biased npn transistor circuit. A "help" screen is available.

Learners analyze an emitter-biased npn transistor circuit. A "help" screen is available.