Learners watch a brief video clip. They then follow step-by-step instructions on how to do a urine colony count and examine the criteria for determining if a colony count represents an infection. A brief quiz completes the object.

In this interactive object, learners read how to use the indefinite articles "a" and "an" with singular count nouns. They omit these articles with noncount and plural nouns. The students then practice using "a" and "an" correctly.

In this interactive lesson, learners study examples of the expressions "a few" and "a little" with count and noncount nouns. They practice using these expressions in a drag-and-drop exercise of 20 sentences.

In this interactive lesson, learners study the use of "many" and "much" with nouns that can be counted and nouns that cannot. They then practice using these words in a drag-and-drop exercise.

Learners view an animation of a counterbalance valve in operation and examine the valve’s internal structure.

Robotic welding is an increasingly popular tool used in industrial welding applications. Knowing how to program the robot is key. Explore how to improve your programming skills by using if-then-else, calls, unconditional jumps, and counters in this learning activity.

Students locate the countries of the Middle East on a map in this interactive exercise.

Students read about five countries in Southern Africa and locate them on a map.

Learners study how a DC motor generates counterelectromotive force. A short quiz completes the object.

Learners observe how to cascade PLC counters to extend the maximum count of one counter.

In this interactive lesson, learners study examples of nouns that can be counted and nouns that cannot. They then identify whether a word is a "count" or a "noncount" noun in a practice exercise.

Learners study an animated PLC counting operation and examine how the count is automatically reset.

Learners examine the two methods used by programmable logic controllers to perform a counting operation using addition or counter instructions. A brief quiz completes the activity.

The technique for designing a MOD 10 counter is introduced. Asynchronous inputs of a JK flip-flop are used to clear the counter.

In this screencast, learners examine the construction of a 7493 IC as mod-2 and mod-8 up-counters. They view how this binary counter can be modified to operate at different modulus counts.

In this animated object, learners examine the proper way to reset a counter instruction in a programmable controller.

In this animated activity, learners examine the construction of a binary counter using a JK flip-flop. The ability of the JK flip-flop to "toggle" Q is also viewed.

Learners examine the counter-reset function of a programmable controller and how it is used.

The learner practices Mandarin Chinese in this animated scenario at a fast food counter.

Learners read about the five smallest countries in the world: The Vatican, Monaco, Naru, San Marino and Liechtenstein. A brief quiz completes the activity.