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Q:

# What is a common wire in an electrical circuit?

A:

A common wire is either a connecting wire or a type of neutral wiring, depending on the electrical circuit. When it works as a connecting wire, the wire connects at least two wires of a circuit together.

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Standard wiring design in U.S. homes involves a neutral wire at the ground potential and two hot wires of 120 volts each. One of the hot wires swings negative and the other one swings positive. A transformer supplies the house and either of the two hot wires can provide electricity to the different 120-volt standard circuits that are in homes. People can combine both wires when a 240-volt circuit is necessary.

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## Related Questions

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An electrical wire ampacity chart can be found in the National Electrical Code Handbook, NFPA 70. The NEC Handbook is published by the National Fire Protection Association, an international non-profit organization. The NEC Handbook table 310.15(B)(16), Allowable Ampacities of Insulated Conductors, can be obtained as a downloaded document from NECConnect.org.

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According to the MIT School of Engineering, a battery provides an electrical charge due to the chemical reactions that take place inside it once it is connected into an electrical circuit. When a circuit connects the positive and negative poles, the anode and cathode inside the battery react with the electrolyte medium separating the two, producing a flow of electrons. This creates an electrical current and provides power.

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A shunt resistor works by measuring either direct or alternating current that flows in an electrical circuit through the voltage drop that is generated across the resistance. Also known as a current shunt or ammeter shunt, this precision device uses the principle of Ohm's Law, which is mathematically represented by the equation V = I x R, where "V" indicates voltage, "I" denotes current and "R" is resistance. The standard units for voltage, current and resistance are volts, amps and ohms, respectively.