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# Basic Physics

Basic Physics

## Magnetism

Magnetism Magnetism is one of the main forces of nature, like the force of gravity. Like gravity, which causes objects to be attracted to each other, magnetis,m causes magnetized objects to be attracted to each other. In most cases, planetary magnetic fields are made by currents of molten material which move around ...

## The Magnetic Field

The Magnetic Field The Magnetic Field The force of magnetism causes material to point along the direction the magnetic force points. As shown in the diagram to the left, the force of magnetism is illustrated by lines, which represent the force. In this diagram, the force points from the positive pole to the ...

## Lightning Formation

Lightning Formation Lightning Formation The sky is filled with electric charge. In a calm sky, the positive (+) and negative (-) charges are evenly spaced throughout the atmosphere. Therefore, a calm sky has a neutral charge. Inside a thunderstorm, the electric charge is spread out differently. A thunderstorm is made up of ...

## Conductors versus Semiconductors

Conductors versus Semiconductors Conductors versus Semiconductors The comparison between the behavior of a normal electric circuit and a semiconductor graphically illustrates the differences that make a semiconductor so useful and unique. The circuit on the top left is very similar in layout to the field effect transistor circuit on the ...

## Home Delivery of Voltage You Supply the Electrons Electric power

Home Delivery of Voltage — You Supply the Electrons Electric power Electric power supplied to homes and businesses is typically AC (alternating current). The electrons do not travel along the power lines overhead but vibrate back and forth at 60 times per second within these lines. The AC outlet in ...

## Transformers – the Point of Power Grid Disruption

Transformers – the Point of Power Grid Disruption Transformers is not a power source. It functions like a lever to convert a small voltage pushing a large electric current into a large voltage pushing a small electric current or vice versa. The power in an electric circuit is equal to ...

## The Basic Facts About Direct (DC) and Alternating (AC) Current

The Basic Facts About Direct (DC) and Alternating (AC) Current What is Direct Current (DC)? The Basic Facts About Direct (DC) and Alternating (AC) Current Direct Current (DC) flows in the same direction all the time through an electric circuit. Electrons flow continuously through the circuit from the negative terminal ...

## The Basics of Electric Circuits

The Basics of Electric Circuits The Basics of Electric Circuits is the continuous flow of electrons through a conducting material (like a copper wire). Electrons are invisible so to understand the basics of how circuits work, it helps to examine a mechanical system that behaves in many ways similar to ...

## Turbulence: All Mixed Up

Turbulence: All Mixed Up Turbulence If you’ve ever ridden in an airplane, you might have some idea what turbulenc-e is. When an airplane flies through a turbulent place in the atmosphere it will bounce around a bit as the wind outside blows the plane in different directions. Nothing to worry ...

## Pressure

Pressure Pressure When you “blow up” a balloon, you are raising the pressur-e on the inside of the balloon. That makes the rubber in the balloon stretch, and the balloon gets bigger. Pressur-e is an idea scientists use to describe how gases and liquids “push” on things. Air has pressur-e. ...