An electrical current that changes strength and direction of flow with a certain regular cycle. Balance Refers to the degree that each circuit phase carries equal amounts of current. Busbars allow connection of the large feeder wires supplying the switchboard to make the transition to smaller wires through switches or circuit breakers, which are in turn connected to the electrical circuits supplied by the panelboard.
Charge is either positive or negative.
Good conductors are generally made of metal, although other substances such as the earth or the human body can be relatively good conductors. Conduits may be made of steel, aluminum, PVC or other materials. Conduits are permitted to act as grounding conductors for electrical circuits as provided by codes. The electric current in a wire is often compared to water flowing through a pipe. Currents produce magnetic fields.