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Direct Current: The Fundamentals

Before we can discuss how electrical components behave or what we can do with electricity, we need to have a general understanding of what electricity is and how it works.

Electrical Concepts

Getting started into the realm of electronics.

What is Electricity?

Just what is electricity? Let's start by defining this term and looking at the origins of the science that deals with it.

Electrons

All electrical phenomena depend on electrons moving from one place to another. Therefore, we need to take a look at electrons, and determine what they are and where they are found.

Static Electricity

Static electricity is known to everyone, but do you know how and why this phenomenon occurs? Can we make practical use of it?

Basic Circuit Concepts

Practical use of electricity requires a closed path for electrons to travel. Let's see what that means, and look at the basic concepts involved with the practical use of electricity.

Schematic Diagrams

In order to remember a particular circuit, record all component values for future reference or for others to be able to build the same circuit for themselves, we need a way to clearly and accurately describe the circuit on paper. This is how we do it.

Ohm's Law

There are some mathematical rules that apply literally everywhere in electronics. Ohm's Law is the first and most basic of these.