Power is a function of voltage times the volume of electrons (current). Power is the ability to do work and is measured in Watts. The higher the voltage the more power you have with the same current.
I'm pretty sure some they are People adapt to their environment, changes to the earths enviroment can be benificial, Changes to the earth environment can be harmful, people change their environment, I'm sorry if I'm wrong on some of these. I hope this helps also :)
They closely resemble the Greek columns