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Science, Technology, Engineering, and Mathematics (STEM)

Electric Fields and Static Electricity
Static electricity is a phenomenon caused by a buildup of unbalanced electric charge that is not moving. We are all familiar with the static electric charge caused by dragging our feet across a carpet and then the sudden static discharge caused by grabbing a door knob. More ...

Direct Current
The nucleus of an atom is relatively heavy, so electricity primarily involves the flow of electrons. The nucleus of an atom generally doesn't move much. More ...

Introduction to Angles: Acute, Obtuse, Straight, and Right
An angle is the amount of turn between two lines around thethe vertex. The name of an angle uses an angle symbol followed by three letters. The letter from one side, the letter from the other side, and the letter of the vertex. The letter of the vertex must go in the middle. More ...

Add, Subtract, Multiply and Divide Positive and Negative Integers
Algebra rules and examples about how to add, subtract, multiply and divide positive and negative integers. More ...

Angle Relationships: Complementary, Supplementary, Adjacent, or Vertical
Angles can be complementary, supplementary, adjacent, or vertical, and these relationships can aid in finding the value of an unknown angle. More ...

Mathematics Factoring Basics
Factoring is very important in algebra because it allows us to perform operations on fractions with different denominators, write polynomials in a simpler form, and make many calculations a lot simpler. This article explains the very basics of factoring. More ...

Properties of Algebra
In this article you learn how to simplify algebraic expressions by substituting given values, distributing, and combining like terms. More ...

Alternating Current
With DC (Direct Current), electric current flows in only one direction. With AC (Alternating Current), current direction reverses periodically. More ...

Leonardo Da Vinci - Leonardo's Animals
Leonardo da Vinci had a great love for animals. He was a vegetarian. He wrote, 'The time will come when men such as I will look upon the murder of animals as they now look on the murder of men.' More ...

What Is an Electronic Circuit?
Circuits provide a path for current to flow. To be a circuit, this path must start and end at the same point. In other words, a circuit must form a loop. More ...