Why AC instead of DC for Electric Power Transmission?

In summary, A.C. is used instead of D.C. to transfer electrical power from the generating station to the consumer in order to reduce energy lost in long distance transmission and costs associated with this process. This is achieved through the use of high voltage and low current, as well as the utilization of transformers that require changing magnetic fields.
  • #1
ZedCar
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Homework Statement


Explain why A.C. is used instead of D.C. to transfer electrical power from the generating station to the consumer.


Homework Equations





The Attempt at a Solution


To reduce the energy lost in long distance transmission. To reduce costs involved in transferring electrical power over long distances.



Above is the answer which I provided though the teacher said it wasn't specific enough and my answer should have included something about

a) high voltage, low current
b) transformers need changing magnetic fields

Was wondering if anyone could help? Thanks very much :smile:
 
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  • #3
Thanks very much Rajini,

I'll take a look at that now.
 

Related to Why AC instead of DC for Electric Power Transmission?

1. Why is AC preferred over DC for electric power transmission?

AC (alternating current) is preferred over DC (direct current) for electric power transmission because it is more efficient and cost-effective. AC can be easily converted to different voltages using transformers, allowing for long-distance transmission with minimal loss of energy. DC, on the other hand, requires expensive equipment for voltage conversion and is less efficient for long-distance transmission.

2. What are the advantages of using AC for power transmission?

The main advantages of using AC for power transmission include its ability to travel long distances with minimal energy loss, its ease of voltage conversion using transformers, and its lower cost compared to DC. Additionally, AC is safer for human use and can power a wider range of devices.

3. Can DC be used for power transmission?

Yes, DC can be used for power transmission, but it is not as preferable as AC. DC is typically used for shorter distance transmission, such as within a building or for powering electronic devices. It is also used in certain specialized applications, such as in renewable energy systems.

4. Are there any disadvantages of using AC for power transmission?

One potential disadvantage of using AC for power transmission is the presence of electrical losses due to the skin effect. This means that at high frequencies, AC tends to travel on the outer surface of a conductor, resulting in increased resistance and energy loss. However, this can be mitigated by using special conductors and equipment.

5. How does AC compare to DC in terms of safety for power transmission?

AC is generally considered safer for power transmission compared to DC. This is because AC can easily be stepped down to lower voltages using transformers, making it less hazardous for human contact. DC, on the other hand, is more difficult to step down and can be more dangerous at higher voltages.

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