Ac is much easier to handle, because you can use a transformer to change the voltage, which is much cheaper, less complicated and more reliable than a dc voltage converter for a given capacity. it is the most important factor that swung the whole debate ac vs dc in support of ac.
- The generation of a.c. is less expensive than that of d.c.
- The machines are simple, robust and require a lot of attention for their repairs and maintenance during their use.
- Wide range of voltages are obtained by using transformer.
- The amplitude of the current can be reduced by using an inductor or a conductor without appreciable loss of energy
- A.c. can easily be converted to d.c. with the help of rectifiers.
- When a.c. is supplied at higher voltages in long-distance transmission, line losses are low compared to a d.c. transmission.
High voltage electric current (hvdc) is much more efficient than hvac systems to transmit much power over long distances, since dc does not suffer from skin effects, resulting in lower losses. also, it takes only one conductor, not 3. actually, the difference in loss and lower number of conductor required for hvdc make it ideal for long distance transmission.
Ac current is better than dc.
- Even from dynamos (eg hydroelectric power plants), we get a direct AC output.
- We can easily obtain AC DC using rectifying circuits (eg bridge rectifier).
for all these reasons, all high voltage transmissions are performed in alternating current and for domestic uses, step-down transformers are used to lower the voltage.