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normally open - Designation which states that the contacts of a switch or relay are normally open or not connected. When activated the contacts close or become connected.

Switches
Switches The are many types of switches but in this section we'll just go into mechanical switches. Switches allow or stop the flow of current or control which path it is to take. The simplest swi


Wire
Wire Wire and cable are used to carry electrical current from one place to another. While many materials can conduct electricity, in wire we only want to move current, so we need a material with high

Drawing Circuits
Drawing Circuits When designing circuits it is not practical to draw physical likenesses of the components you wish to use. In place of each component a symbol is use to represent it. For example:

Circuits
Electrical Circuits An electrical circuit is anything that allows current to flow, from a bulb attached to a battery to a desktop calculator. A simple circuit The most basic circuit you can get i

Measuring Electricity
Measuring Electricity The best and cheapest way to measure electrical properties is with a multimeter. If you are planning on playing with electronics it is the first thing you should buy as you will