The Advantages of DC. More efficient: Over long distances, DC transmission can move more power with less electrical losses than an equivalent AC transmission line. Lower Cost: Higher efficiency means a lower transmission cost, helping renewable energy compete against other power sources.

Advantages of AC Transmission System over DC Transmission System

AC (Alternating Current) transmission system is widely used for transmitting electrical power over long distances compared to DC (Direct Current) transmission system. The main advantage of AC transmission system over DC transmission system is:

Less Losses in Transmission over Long Distances

AC transmission system has less losses in transmission over long distances compared to DC transmission system. This is due to the following reasons:

- AC voltage can be easily stepped up and stepped down using transformers. This allows the use of high voltage and low current for transmission, which reduces the I2R losses in the transmission lines. In DC transmission system, voltage cannot be easily stepped up and stepped down using transformers, which makes it difficult to transmit power over long distances with low losses.
- AC transmission system has lower skin effect and proximity effect losses compared to DC transmission system. Skin effect is the tendency of AC current to flow near the surface of a conductor, which increases the effective resistance of the conductor. Proximity effect is the tendency of AC current to flow in the outer layers of a conductor, which increases the effective resistance of the conductor. These losses are more pronounced in DC transmission system compared to AC transmission system.

Other Advantages of AC Transmission System over DC Transmission System

- AC transmission system is easier to generate and distribute compared to DC transmission system.
- AC transmission system is less expensive compared to DC transmission system.
- AC transmission system is more reliable and requires less maintenance compared to DC transmission system.
- AC transmission system is less prone to insulation problems compared to DC transmission system.

Conclusion

In conclusion, AC transmission system has several advantages over DC transmission system, the most significant of which is less losses in transmission over long distances. This makes AC transmission system the preferred choice for transmitting electrical power over long distances.

Answer should be A because AC is easy transform through transformers which is not possible in case of DC.