Asked by tejvir | 2nd May, 2012, 07:35: PM

Expert Answer:

Electromotive "force" is not a Force (measured in newton) but a potential, or energy per unit of charge, measured in volts. Formally, emf is the external work expended per unit of charge to produce an electric potential difference across two open-circuited terminals. The electric potential difference produced is created by separating positive and negative charges, thereby generating an electric field.The created electrical potential difference drives current flow if a circuit is attached to the source of emf. When current flows, however, the voltage across the terminals of the source of emf is no longer the open-circuit value, due to voltage drops inside the device due to its internal resistance.

Answered by  | 3rd May, 2012, 12:21: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.