June 25, 2009

RESISTOR

In real this is how a resistor looks like


The circuit symbol of a resistor is

Function of a Resistor
Resistors restrict the flow of electric current in a circuit.

How it is measured..??

The resistance is measured by "Ohms" and its symbol is

The value of resistance depends on what..??

Resistance is Determined partially by Composition,
and is inversely proportional to Cross Sectional Area


Notice Also that Resistance is proportional to Length
How resistance is represented in a resistor
They are represented by color codes and there are 4 band, 5 band, 6 band color codes but the most widely used one is 4 band, the color code is given by


Resistors in Series
In series the value of resistors just add up, i.e a single equivalent resistance of the series resistors will be the sum of all the series resistors

so, R equivalent = R1 + R2 + R3 + . . .
Resistance in Parallel
In parallel the resistors behave in a different way

R equivalent = 1 ÷ (1/R1 + 1/R2 + 1/R3 . . .)


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Electronics is the study and use of electrical that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves. and semiconductors. The pure study of such devices is considered as a branch of physics, while the design and construction electronic circuits to solve practical problems is called electronic engineering.

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