Why is a Return Wire Necessary in Electrical Distribution?

In summary, a return wire is provided from the generating plant to the load to allow for a closed loop of current flow. The return wire carries the same amount of current as the "go" wire, but the voltage may differ due to power consumption at the load. The concept of closed loop is met through the use of three-phase power transmission. The speed of propagation for voltage and current waveforms is dependent on the length of the wire loop or transmission line. Kirchoff's law states that the sum of currents going into and from a point is zero, meaning the current flowing to and from the load will be the same. However, power consumption at the load causes a voltage drop, allowing for the transfer of power.
  • #1
physicspriya
2
0
i m an electrical student. can anybody clearly tell me why is a return wire provided from the generating plant to the load? does current flow through the return wire or is it simply meant to form a closed lop?
 
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  • #2
The wire is provided because current flows through it, of course. If it had no function, it would seem a bit odd to spend so much money building it.

- Warren
 
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so the concept of closed loop is met.Now my next question is does the return wire carry the same amount of current as the go wire?please explain this in detail. Thanks for responding to the previous question
 
  • #5
physicspriya said:
so the concept of closed loop is met.Now my next question is does the return wire carry the same amount of current as the go wire?please explain this in detail. Thanks for responding to the previous question

Thread moved to Homework Help. physicspriya, what do you think? What has your reading about electricity told you so far about your question?

Keep in mind that the propagation of the voltage and current waveforms will happen at a significant fraction of the speed of light, so the answer to your question will depend on how long the wire loop or transmission line is... Can you tell us why?
 
  • #6
Your question I believe is about voltage and current. Kirchoff law states that the sum of currents going into and from a point/node is zero. The current flowing to the load and away from the load will be completely the same. However loads consume power so if the current is the same then the voltage much reduce. The power transferred is due to the voltage drop at the load. For electricity to flow - there must be a ring or loop to and from the source.
 

1. What are return wires in distribution?

Return wires in distribution refer to the wires or conductors that complete an electrical circuit by carrying the current back to the source, usually a power plant or substation. These wires are also known as neutral wires and are typically grounded to provide a safe path for electrical current to flow.

2. Why are return wires necessary in distribution?

Return wires are necessary in distribution to ensure that electrical current can flow continuously and safely. Without a return wire, the electrical circuit would be incomplete and the current would not flow properly. Additionally, return wires help balance the electrical load and prevent overloading of the system.

3. How are return wires different from supply wires?

Return wires and supply wires are both part of an electrical circuit, but they serve different purposes. Supply wires, also known as hot or live wires, carry the electrical current from the source to the electrical load. Return wires, on the other hand, carry the current back to the source to complete the circuit.

4. Can return wires be used for other purposes besides completing a circuit?

In some cases, return wires can be used for other purposes besides completing a circuit. For example, in three-phase power systems, the return wire can also act as a neutral wire and provide a low-resistance path for unbalanced currents. Additionally, return wires can be used for grounding to protect against electric shock and damage to electrical equipment.

5. How are return wires connected in distribution systems?

In distribution systems, return wires are typically connected to a grounding system at the source, such as a transformer or substation. The grounding system provides a safe path for excess current to flow in the event of a fault or surge. In residential and commercial buildings, return wires are connected to the neutral bus bar in the main service panel, which is then connected to the grounding system.

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