Question

Which of the following describes the common domestic power supplied in India?
\[\begin{align}
  & A)220V,100Hz \\
 & B)220V,50Hz \\
 & C)110V,100Hz \\
 & D)100V,50Hz \\
\end{align}\]

Answer 1

Hint: We must know that the amplitude and frequency of power supply in India depends upon both environmental temperature factors as well as wire material used and temperature factors affecting it.

Complete step by step answer:
The domestic power supplied in India is decided by the government according to our environmental conditions and the wires we use for supply. All the electrical appliances we use in our country are configured according to this.
 We must know that the mains voltage in India is \[220V\] which is alternating at 50 cycles per second. It is the same as many of the European countries.
There is also another factor that \[220V\] has lower distribution and has lower distribution cost and that is why it was popularly taken up. For distributing this voltage we use high resistance wires and the power will be very high as power is given as the product of square of voltage and resistance. So, this level of voltage supply is not much safer because it is very powerful.
Now, if we take the case of the USA, they use \[110V, 60Hz\] because it is assumed to be the safer voltage level of the DC system.
So, we can conclude that in India, we have common domestic supply at the range of \[220V, 50Hz\]. Where, \[220V\] is the amplitude of mains voltage and \[50Hz\] as the mains frequency. Therefore, option b is the right answer.

 Note:
If we notice the difference of plug points in the USA and India, This is because the AC mains frequency in the USA is \[60Hz\] and India is \[50Hz\]. We must know that the impedance of a circuit largely depends on frequency of AC mains. So, there must be no variation in the mains frequency. All the electrical products made for Indian market are configured as they could work optimally at \[50Hz\].