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Electrical and Electronics Engineering Interview Questions and Answers

Question - What are the functions of the different colored wires in the electric circuit?

Answer -

In the electric circuit, the different types of colored wires specify the different functions they do. Primarily, there are seven types of colored wires in the electric circuit that have their task.
Black: The black wire is the primary source of power supply in the electric circuit. This is not used for ground wires. It is either used in the hot state or live state.
Green: The green wire is used to connect to the ground terminal. An outlet box contains green wires.
Red: The red wire is the second primary wire. It is used to transmit the live state of the wire. It can be used in different types of interconnections and are present in a circuit of 220 volts. Moreover, it can either be connected to another red wire or a black wire.
White/Gray: The white or gray wire is the neutral wire. It is used to carry out the unbalanced load to the terminal. The terminal of this wire is located in the ground. This wire can connect itself to its types of wires.
Blue/Yellow: The blue or yellow wires carry power, so they are used as live wires. Generally, most devices do not have these wires.

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