Category Archives: Electromagnetism

formula of electromotive force

Electromotive force

Electromotive force Definition

It is a unit measurement of energy that causes current to flow through a circuit. It is generally abbreviated as EMF. An electric current arises only when there is a difference in potential, called voltage. EMF can either be generated by an electrochemical cell or a magnetic field. The energy per unit charge is normally denoted by the symbol ε. An electric potential difference results when the positive and negative charges are separated. Attachment of a circuit to the source of EMF causes a current flow. There is a sudden dip in the voltage due to internal resistance that develops within the EMF source. Continue reading