Archive for 2011

All about Capacitors

Capacitor

A capacitor was formerly known as condenser. It is a device for storing electric charge. Practical capacitors are made using various methods. But in all of them there are at least two conductors separated by an insulation.

 

A pair of conductors separated by a dielectric or insulator forms a capacitor. If we apply a potential difference or voltage across these two conductors, then a static electric field is formed across the insulator or dielectric. Hence, positive charges are stored in a plate or conductor and negative charges in the other. The unit of capacitance is Farad. It is the ratio of electric charge to the potential difference on each conductor.
 

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Resistor Colour Code

Resistor Color Code:
The value of a resistor’s resistance is indicated on its body by a color band.  This band indicates the resistance with percentage of tolerance.
Using color code gives reliability of resistance calculation and enhances look of the resistor. It is also called the “Color Band”. The color band on a resistors body looks like below:



                                                   Figure: 1


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All about Resistors


What is a Resistor?
Answer: These are very simple element except they have a colour coding on their body to mention how much resistance they have. The work of a resistor is very simple, “TO RESIST”. And of course it resists current (electricity).  
It is a two-terminal electronic component that implements electrical resistance as a circuit element. The current flowing through a resistor is in a direct proportion to the voltage across the resistor's terminals. 







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What is a Circuit?

What is a Circuit?


Answer: Simply, circuit is the interconnection of electrical components. 

 
Here in the figure 3 electrical components are connected together with wires. Hence it makes an electrical circuit.

Electrical Components: There are 3 basic electrical components. These are: Resistor, Capacitor and Inductor.


Resistors: These are very simple element except they have a colour coding on their body to mention how much resistance they have. The work of a resistor is very simple, “TO RESIST”. And of course it resists current (electricity).  

This is the symbol of resistors. To know details about resistors click here.


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