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In an electrical schematic, symbols are used to represent basic components, and lines drawn between them indicate connections.

When two or more lines meet each other, there is a connection (as in example 1). In example 2 the line A dips as it passes BC, this indicates that A does not make contact with BC.

Some common symbols used are:

Ratings for components are written by the side of their symbols.

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When in doubt, reverse the polarity