TOPIC 1. Electricity

What is Electricity? (video) It's a lot easier to describe what it does than what it is. For example, electricity operates our lights, runs our refrigerators and powers our electric motors. The word "electric" comes from the Greek word "amber" and has been used to describe a wide range of related phenomena. We can't see electricity, but we can see its effects, such as light.
Electricity can exist in a number of forms, but there are two types of commonly used electricity:

Direct Current, which is provided by batteries.
Alternating Current, which is provided by electric utilities or other power generators in the form of electrons--called current--flowing through a wire--called a conductor

Electricity
Direct Current (DC)
Alternating Current



Go to TOPIC 2. Ohm's Law

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