Is the home electricity DC or AC?
Home electricity is Alternating Current (AC). AC can be transmitted much longer distances, over much less massive conductors than direct current (DC).
Actually, d.c. can be transmitted much longer distances, with less massive conductors and lower losses, than a.c! However, the reason that a.c. is more common for transmission and distribution is the ease and efficiency with which its voltage levels can be changed using transformers. D.C. transmission at high voltage over very long distances is used because it is much more efficient than a.c. transmission, but changing its voltage levels is far more difficult and inefficient compared with a.c.