when a light is on it is part of a scolde circuit
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Closed circuit
It has components that are arranged end to end in order to produce light.
The bulb converts energy from the power source into light and heat. It is the load in the circuit.
it would be ok in a circuit which didn't need a light bulb.
There are many ways you can design a simple traffic light circuit. I recommend you to use a 4017 IC. Please check this site as reference. It's a two way traffic light circuit. http://circuitdesolator.blogspot.com/2011/01/traffic-light-circuit-based-on-4017.html
A circuit symbol is a symbol that represents a component in a circuit. For example a light bulb is a circle with a cross in it.