Learners examine how CEC, base saturation, and soil pH work with each other to define plant nutrient availability.

Students read how to determine and calculate the degree of saturation for a given sample of soil or aggregate based on the weight-volume relationship.

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 different definitions of "acids" and "bases." In an interactive exercise, they identify if a substance is an acid or a base.

Students view a dc analysis of a base-biased NPN transistor.

In this learning activity you'll examine a systematic method for converting a decimal number (base 10) into a binary number (base 2).

In this animated object, learners examine a systematic method for converting a decimal number (base 10) into an octal number (base 8).

In this animated activity, learners examine a systematic method for converting a decimal number (base 10) into a hexadecimal number (base 16).

The learner views the operation of a transistor switching from saturation to cutoff. A brief quiz completes the activity.

In this animated and interactive object, learners use a memory device to identify NPN and PNP transistors. Learners also examine how much the transistors turn on when the voltage applied to the base is varied.

Learners tackle this interactive learning object after studying the mathematics of buying. This activity ties together the ideas of net cost, list price, trade discounts, cash discounts, net cost equivalent, and single discount equivalent, as well as the concepts of part, base, and rate.

Learners view several movie clips that demonstrate the use of an indicator to follow the neutralization reaction that occurs when an acid and a base are mixed. Students test their knowledge in a series of questions. Immediate feedback is given.

Learners use two calculations to prepare a graphical solution to the biasing of bipolar junction transistors and junction field effect transistors. This method eliminates the problem of having to re-calculate the operational Q point when dealing with hard saturation.

Students use the Base Minus One Complement method to perform hexadecimal subtraction.

Students use the Base Minus One Complement method to perform binary subtraction. This learning activity has audio content and immediate feedback.

Learners use the Base Minus One Complement method to do octal subtraction.

Students add suffixes to base words to form nouns in this interactive lesson.

Students review the spelling rules for adding a suffix to a base word. They practice changing the "y" to "i" for some of the words that end in "y."

Learners add suffixes to base words to form new verbs in this interactive exercise.

Users calculate the tonnage required to punch holes in a specific base metal. The formula to be used is provided along with the tensile strength for various metals. A calculator is required.