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Can somebody please explain me something????

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gaurav95:
Hi
       Can somebody please explain me something

          1) Can u give me some e.g.s of application of left hand rule and right hand rules.......pls i don't understand it where to use which one............?

             2)In transistor IB+IC=IE So my teacher told that the IC current is amplified how is that???

              3)IN diodes what is full wave/half wave rectifiacation.....why and where and when its used......................??
                4)what is potential divider,and time delay circuit...............??

I have asked  too many doubts.......... Thanks a lot............

Syed Kazim:
Fleming's Left-Hand Rule is used when dealing with motors. It shows the direction of the thrust on a conductor carrying a current in a magnetic field. It can be recalled by remembering that "motors drive on the left, in Britain anyway".

The Right-Hand rule is used when dealing with generators. It shows the direction of induced current flow when a conductor moves in a magnetic field. It can be recalled by remembering that the right hand is used when dealing with generators.

For both these rules:

* The Thumb represents the direction of Motion of the conductor.
* The First finger represents the direction of the Field. (north to south)
* The Second finger represents the direction of the induced or generated Current (the direction of the induced current will be the direction of conventional current; from positive to negative).

Syed Kazim:
Potential dividers

Potential dividers are used for dividing up the voltage, so that a part or parts of a circuit only receive the voltage they require. Potential dividers consist of two or more components (usually resistors) arranged in series across a power supply.

The circuit diagrams attached show three common types of potential divider: two fixed resistors in series, a fixed resistor and LDR in series, and a thermistor and variable resistor in series. (Note that the resistors are usually drawn vertically on a circuit diagram.)

Syed Kazim:
Rectification

A common use for diodes is rectification - that is, the changing of alternating current into direct current. (An alternating current (AC) is one which flows alternately in opposite directions around a circuit, while a direct current (DC) is one that always flows in one direction only).
A rectifying circuit can be found in the transformers used with many types of equipment that require a mains alternating current to be converted into a smaller direct current - eg electronic keyboards or mobile phone chargers.

The circuit diagrams attached show the two methods of rectification.

WARRIOR:

--- Quote from: Syed Kazim on May 16, 2010, 03:41:58 pm ---Potential dividers

Potential dividers are used for dividing up the voltage, so that a part or parts of a circuit only receive the voltage they require. Potential dividers consist of two or more components (usually resistors) arranged in series across a power supply.

The circuit diagrams attached show three common types of potential divider: two fixed resistors in series, a fixed resistor and LDR in series, and a thermistor and variable resistor in series. (Note that the resistors are usually drawn vertically on a circuit diagram.)

--- End quote ---

awsome tips ! + rep ! this was good revision for me + the left hand remembring thing was funny :P adn useful cheers

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