# Most efficient way to transmit 1 KVA

1000 volt and 1 Amp equal 1000W 1 volt and 1000 Amp equal 1000W 500 volt and 2 Amp equal 1000W 5 volt and 200 Amp equal 1000W |

The question becomes which is the most efficient way to send power (voltage and current) down a wire.

Power lines have losses when heat is generated in them by electric current moving through the wires. There is a loss of power down the length of the wire.

**Example 1**

Double the voltage | ||

halves the current | ||

The power loss decreases by `2^2=4` |

Or another way of saying this

Increase the voltage by a factor of `2` | ||

decreases the current by a factor of `2` | ||

The power loss decreases by `2^2=4` |

**Example 2**

Increase the voltage by a factor of `100` | ||

decreases the current by a factor of `100` | ||

The power loss decreases by `100^2=10,000` |

So there are massive advantages for sending high voltage over long distances in a wire.

HIGH VOLTAGE = LOWER ENERGY LOSSES

Which equals thinner cables needed.