Electrical Wiring Diagrams Basics

Push-to-make switch A push switch allows current to flow only when the button is pressed. This is the switch used to operate a doorbell.

Wires joined A blob should be drawn where wires are connected (joined), but it is sometimes omitted. Wires connected at crossroads should be staggered slightly to form two T-junctions, as shown on the right.

Follow these tips for best results: Use the correct symbol for each component. Draw wires as straight lines (use a ruler). Put a blob () at junctions. Label components such as resistors and capacitors with their values. The positive (+) supply should be at the top and the negative (-) supply at the bottom. The negative supply is usually labelled 0V, zero volts (this is explained on the voltage page. If you are drawing the diagram for science please see below about drawing the electronics way.

Cell Supplies electrical energy. The larger line is positive (+). A single cell is often called a battery, but strictly speaking a battery is two or more cells joined together.

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