Question

Why volt is always in a multiple of 11. Like 220 volt , 1100 volt ?

Answer 1

Initially In the 19th century after the AC transmission became popular it was believed that there is transmission loss of around 10% in the power line.

Hence, suppose you have to transmit 100 Volts then you have to send 10% extra Voltage so that the losses in the power line is compensated i.e. 10V extra in this case which turns out to become 110 Volts when 10 Volts is added together with initial voltage.

However, there is a common myth for taking this as a reason for form factor

Which is defined as the ratio of rms value to the average value in an alternating current waveform

form factor=\frac{V{rms}}{V{avg}}

which is equal to approximately 1.11 for a sine wave.

this is no true. Form factor has to do nothing with this.

Nowadays we are using 400 V instead of 440 V, or 230 V instead of 220 V.

For Electricity transmission in certain countries generally multiples of 11 are still very common.

However in certain other countries for example New Zealand most voltages are 6.6kV,11kV and 400kV which is not a multiple of 11.

Answer 2

no Bharat it is not only in the multiple of 11 but also 5,2,10 and many more so first you notice it my friend
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