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In some circuits, there is more than one switch that can turn on the output. These circuits employ “OR logic”, since the output will turn on with either switch A or switch B. In electrical terms, these switches are placed in parallel branches, and there is a junction that allows the electrical current to flow in two different directions.
In other circuits, there is more than one switch that can turn off the output. These circuits employ “AND logic”, since the output will only turn on if both switch A and switch B are connected. In electrical terms, these switches are placed in series, with no junctions to allow the current to branch out.
Did you find any circuit boxes that could be described as turning on for:
- A OR B OR C?
- A AND B AND C?
Open these circuit boxes see if you can:
- find the junctions in the OR circuit;
- trace the series path for the AND circuit.
