An electromagnet is composed of a coil of wire wound around a core of a soft iron.


A negatively charged subatomic particle with much less mass than a proton but with a charge equal and opposite to the charge of a proton.


Energy is the capacity to get work done, measured in Joules (J).

Energy Bands

The arrangements of electrons into definite shells around the nucleus of an atom.

Electrostatic Field

The field of force surrounding any charged body.

Economic dispatch

The distribution of total generation requirements among alternative sources for optimum system economy, with due consideration of both Incremental generating costs and incremental transmission losses.


The ratio of the useful power output to the total power input.

Electrical load

Electric power used by devices connected to an electrical generating system.

Electromotive force (emf)

A voltage produced in a closed path or circuit by the relative motion of the circuit or its parts with respect to magnetic flux.

Equivalent radius

The conductor radius r multiplied by e-1/4 (i.e., re-1/4) where e is the base of the natural logarithm.

Electric circuit

A group of components that use voltage, current, and resistance to perform a function in a closed path.


It is the ratio of output power (POUT) to the input power (PIN).

About Ahmad Faizan

Mr. Ahmed Faizan Sheikh, M.Sc. (USA), Research Fellow (USA), a member of IEEE & CIGRE, is a Fulbright Alumnus and earned his Master’s Degree in Electrical and Power Engineering from Kansas State University, USA.

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