batteries
Yes.
Yes, MacBooks use lithium-ion batteries as their power source.
because US has no other source to kill enemy
use a dc power source. preferably an ac/dc power adapter. any dc power source will do.
Electricity
regert
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.
No.
photovoltaic