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Why Ac Systems Are Preferred Over DC? | Why is AC power used instead of DC?

AC power is used instead of DC

We (Usually all over the world), In all the countries, use AC voltage for consuming and for using electricity. Why not DC voltages?
It may ask you in an interview so it’s better to know it first.
There are some factors for using AC rather than DC.

  • From the powerhouse/power plant, we produce AC voltages so it’s better to use AC rather than convert it from AC to DC (because there is extra no benefit to using DC). We need to change transformers, breakers, and other devices that we are using at the powerhouse.
  • It is easy to maintain AC voltages and step up & step down AC voltages as compared to DC.
  • The cost of power plants is much lower than the DC generation plant (transformers, circuit breakers, etc).

Why is AC used for long distance power transmission instead of DC?

It is more convenient to step up/down voltage for AC than for DC

Power wasted only depends on resistance and current in the circuit and does not depend on whether it is AC or DC.
If P is the power transmitted, and R is the resistance of the line:
Power loss = I2R = V2R
It is better to have a lower current and higher voltage to reduce losses. AC is much easier (therefore cheaper) to step up and down in voltage(using a transformer) than DC, and can be done more efficiently than the much more expensive and complex DC step-up/step-down systems. That is why AC is used for power transmission.

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Aanchal Gupta

Welcome to my website! I'm Aanchal Gupta, an expert in Electrical Technology, and I'm excited to share my knowledge and insights with you. With a strong educational background and practical experience, I aim to provide valuable information and solutions related to the field of electrical engineering. I hold a Bachelor of Engineering (BE) degree in Electrical Engineering, which has equipped me with a solid foundation in the principles and applications of electrical technology. Throughout my academic journey, I focused on developing a deep understanding of various electrical systems, circuits, and power distribution networks.

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