Electricity - Schematic Diagrams I Teacher's Notes  
  Schematic Symbols
Engineers need to record their circuit ideas so that they can be shared with others. To record and share their circuits, they use schematic diagrams. Schematic diagrams are a form of short-hand. Rather than drawing each item in a pictoral way, each item is represented by a symbol. Once you learn the symbols, you can read any circuit diagram.
connected The first concept of schematic diagrams is "connection". Items in the diagram at the right are connected via wires (just like in the real world). In this picture, item A is connected to item B using a wire.

  connected not connected To show multiple items connected together, we use a dot at the point where the wires cross, to show that they are connected. In the diagram at the left items A, B, C, and D, are all connected together.
When wires cross without the connection dot, they are not connected. In the diagram at the right, item A is only connected to item B, and item C is only connected to item D.

As mentioned above, in a schematic diagram each type of component is represented by a symbol. Here are the symbols for several types of switches, a lamp, a single cell, and a battery. We'll be using these symbols to create schematic diagrams on the next page.

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