Abstract: This paper describes some experimental and ideological processes during the early development of electricity，such as capacitance，voltage，electromotive force and current. The discovery process of Ohm’s law is also described. The birth of these concepts and laws is hidden in the depth of history，and it is helpful for the teaching of electromagnetics to excavate and describe these historical processes.

Key words: capacitance, voltage, electromotive force, current, Ohm law, history of electricity