WEFOUNDAuto Electricity and Electronics Shop Manual: Natef Standards Job Sheets for Performance-based Learning

Electricity is the set of physical phenomena associated with the presence and motion of electric charge . Although initially considered a phenomenon separate from magnetism , since the development of Maxwell's equations , both are recognized as part of a single phenomenon: electromagnetism . Various common phenomena are related to electricity, including lightning , static electricity , electric heating , electric discharges and many others.

The presence of an electric charge, which can be either positive or negative, produces an electric field . The movement of electric charges is an electric current and produces a magnetic field .

When a charge is placed in a location with a non-zero electric field, a force will act on it. The magnitude of this force is given by Coulomb's law . Thus, if that charge were to move, the electric field would be doing work on the electric charge. Thus we can speak of electric potential at a certain point in space, which is equal to the work done by an external agent in carrying a unit of positive charge from an arbitrarily chosen reference point to that point without any acceleration and is typically measured in volts .