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Breadboards are used for testing and experimenting with electronic circuits. They are very convenient since all you have to do is plug in the components. Oh the surface of a breadboard, there are many holes for plugging in components:
The bread board has many strips of metal which run underneath the board that connects the component. The metal strips are laid out as shown below:
Each strip is a connection. So whichever components connected to a certain strip are connected to eachother.
The blue strips shown in the illustration are usually used for connecting the batteries and the green strips are for the components.
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