In this learning activity you'll explore what a denial of service attack is and learn how a single hacker can take down an entire system.

In this learning activity you'll examine how computers operate in a peer-to-peer network operating system.

In this learning activity you'll explore the effect of connecting voltage sources in series to increase voltage applied to a load.

In this learning activity you'll understand what flow charts are and how they're used to create computer programs.

In this interactive object, learners experience how the three primary flight controls allow a pilot to determine the motion of the airplane during flight.

Learners follow an EMT response at a high school involving a patient who complains of having difficulty breathing. In this detailed activity, learners examine response procedures, resources, and medications.

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

This learning object introduces the student to the calculations involved in a sieve analysis -- including percentage retained and percentage passed.

Students read about cash flow problems and review suggestions for dealing with them.

In this animated and interactive object, learners follow steps that begin with choosing the correct drive roll and include feeding the electrode wire from the spool to the welding gun.

Learners work problems to make conversions between RMS, average, peak, and peak-to-peak AC voltages.

Learners view a vector diagram for a series RL circuit. Information on the voltage across each component, the total voltage, and the phase angle is included.

Students read about foods that are high in nutrients compared to the number of calories. They identify if certain foods have high or low nutrient density.

Learners examine the accounting equation and view examples of how account items and figures are included in each part of the equation.

In this interactive object, students read how to calculate the blank size for cylinders in a three-roll pinch roller. A calculator is required for the brief quiz that completes the activity.

In this screencast, learners read about the seven hormones that help regulate blood glucose.

This lesson gives the student an overview of grinding wheels and pedestal grinder procedures.

Learners use the National Electrical Code to determine the size of a motor overload protection device.

Learners study an animated block diagram that describes the function of each element in a closed-loop system used in industrial automation.

The learner will explore the techniques used to identify cause-and-effect relationships of a particular problem.

The learner will become familiar with eight principles of collaborative leadership to build a team where members find satisfaction and reward in their job.

The learner will learn the programming steps that are used to create circular motions with robots.

Learners read how they can make menus more pleasing to the senses by paying attention to shape, form, texture, temperature, color, flavor, and visual appeal.

Students read how to determine and calculate the saturated density for a given sample of soil or aggregate, based on the mass-volume relationship. Practice problems complete the activity.

Learners examine the 10 steps of the accounting cycle. The cycle begins with the analysis of source documents and ends with the post-closing trial balance and interpreting the financial information.