regert
Yes, MacBooks use lithium-ion batteries as their power source.
use a dc power source. preferably an ac/dc power adapter. any dc power source will do.
Electricity
batteries
Power direct from electrical outlet that matches country power source where retail sale was made
Hydroelectric power (dams)Tidal powerWave power
Solar power is generated by an unlimited source of energy called the sun.
An Ethernet connection relates to connectivity to your modem and does not represent a power source for your computer.
photovoltaic
No.
wind, and sometimes they have to use electricity to power the machines they use to make the windmills.
Thermal energy