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circuit diagram – a symbolic picture of a circuit


Circuit symbols and diagrams


The different parts of a circuit are called the components. When you want to show what a circuit is made of, it would take a long time to draw every component. Instead, we use symbols to represent the components. This is called a circuit diagram. The table below lists the different components of a circuit and their symbols.


Table 1 Symbols for components of electrical circuits Component


Cell


Conducting wire Bulb


Switch (closed) Switch (open)


Symbol


Resistor


Look at the photograph and diagram of the circuit below. The photograph on the left is what the circuit looks like. The diagram on the right is a circuit diagram of the same circuit.


Figure 3 A simple circuit and its circuit diagram


110 Topic 2 Energy transfer in electrical systems


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