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Why do power plants transmit electricity at high voltage

Hello friends,
You must be knowing that power plants generate high voltage of the range 11kv to 22kv.Well if you think it's high let me tell you that this voltage increases nearly 10 to 50 times at substations and even more at national grids from where it gets transmitted to longer distances.Now you must be wondering why do we need such high voltages when our household voltage is just 220 to 240 volts.Reason lies in this formula P=VI,where power being constant,I depends inversely on voltage.Higher the voltage lower will be current and H=IR2T meaning lower current means lower heat loss.Thus to avoid losses voltage is kept high during transmission and is brought to desires voltage by step down transformers.

Thank You...

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