| A | B |
|---|
| electric fields | the electric force per unit charge |
| magnetic fields | a region around a magnetic material or a moving electric charge within which the force of magnetism acts. |
| magnetic domain | region within a magnetic material in which the magnetization is in a uniform direction. |
| magnetic poles | each of the two points or regions of an artificial or natural magnet to and from which the lines of magnetic force are directed. |
| direct current | an electric current flowing in one direction only. |
| alternating current | an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies. |
| electromagnet | a soft metal core made into a magnet by the passage of electric current through a coil surrounding it. |
| electromagnetic induction | the production of an electromotive force across a conductor when it is exposed to a varying magnetic field. |
| transformers (step up and step down) | device that transfers electric energy from one alternating-current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage |
| commutator | a device for reversing the direction of flow of electric current. |
| equivalent resistance | 3.The equivalent or overall resistance of the collection of resistors |
| voltage | an electromotive force or potential difference expressed in volts |
| resistance | the ratio of the voltage applied to the electric current whichflows through it |
| current | is independent of the type of charge carriers flowing |
| parallel curcuit | a closed circuit in which the current divides into two or more paths before recombining to complete the circuit |
| series circuit | a closed circuit in which the current follows one path |
