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

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

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

You will be guided through doing a precision layout a part from a drawing.

In this interactive object, students examine a type of chemical bond known as the "hydrogen bond."

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.

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

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

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

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

In this animated object, learners examine how changes in pH affect the salt bonds in strands of hair.

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.

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.

Students use algebra to rearrange formulas and solve for the missing volume, density, or mass quantity.

In this screencast, learners examine the properties of the hydrogen bond and how the bond changes when hair is shampooed or styled.

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

In this animated lesson, learners read about the disulfide bond, the second strongest chemical bond in the hair. This bond can only be altered by chemicals.