The principal advantage of sending electric power across country on very high voltage transmission lines is that

The principal advantage of sending electric power across country on very high voltage transmission lines is that it minimizes the power loss due to resistance in conductors.

To answer this question, we must keep in mind the relationship between power, current and resistance, that can be written as:

So power is dissipated as heat. From the equation, the power loss in the transmission line is proportional to . Another relationship we need to talk about is between power, current and voltage:

As you can see, current is inversely proportional to voltage, so if you increase the voltage, then the current decrease and the power loss also decreases.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..