Terms-F

Filter:a circuit which is dependent on frequency.
Filtering:a process used to eliminate specific frequencies
Frequency Modulation (FM):a modulation technique that checks changes in an information signal

Fall time:Time taken by falling edge of a pulse to go from 90% of peak voltage to 10% of peak voltage.

 Farad
The basic unit of capacitance.

Ferrous
Composed of iron. A ferrous metal exhibits magnetic properties as opposed to non-ferrous material.

Fiber optics
Laser's light o/p contains information that is given between two points say A to B by thin glass optical fibers.

Field effect transistor (FET)
A voltage controlled transistor in which the source to drain conduction is manged by gate to source voltage.

Filament
Thin thread of carbon or tungsten which produces heat or light with the movement of current.

Filter
Network consisting of capacitors, resistors and/or inductors used to pass certain frequencies and block the rest.

Flip flop
It stores binary value 0 or 1.

Flux
In magnetism, the magnetic field consisting of lines of force.

Flux density
Determines strength of the magnetic field.

Forward bias
A PN junction bias which allows current to flow through the junction. \

Free electrons
Electrons that are not in any orbit around a nucleus.


Frequency
Rate of recurrence of a periodic wave. Measured in Hertz

Full scale deflection
Deflection of a meter's pointer to the farthest position on the scale.

Full wave rectifier
Rectifier that makes use of the full AC wave in both the positive and negative half cycles.

Fuse
A protective device in the current path that melts or breaks when current exceeds a predefined maximum value