Resistor Series and Parallel calculations

RESISTOR (Ω)

           Resistor is the most commonly used in electronic devices. The main function of resistors is to oppose the flow of current. Both current AC and DC are equally opposed.  Resistors also provide a desired voltage drop.

Resistor color code calculation trick click here

SYMBOL :  

 

The unit of resistor is ohm (Ω).  The larger value of the resistor is in kilo ohms (KΩ) and In mega ohms (MΩ)

                Ohms                     =              1                             

                Kilo Ohms             =              10 ³         = 10×10×10                         = 1000 ohms

                Mega Ohms          =              10 ⁶         = 10×10×10×10×10×10     = 1000000 ohms

               

                1000 ohms            =              1 kilo ohms

                1000 kilo ohms    =              1 mega ohms

TYPE OF RESISTORS

Fixed Resistors & Variable Resistors

A) Fixed Resistor

a) Carbon Resistor            

           The value of these resistor is represented by the color code printed on it.  They are available in different wattage (Power) from 1/4 watt, 1/2 watt, 1watt and 2 watt.  They are used in all electronic devices.  The values of resistors are from ohm to mega ohms.

b) Wire wound Resistors

           The value of these resistors along with wattage is printed on the body of the resistors. They are available in different colors like Red, white, green, black, brown, violet, etc.  They are used in high voltage power supply.  They are also called as low value high wattage resistance. They are available wattages from 2.5w, 5w, 10e, 20w and 40w etc. 

2) Variable Resistors

                These resistors are also called as Potentio-meter or (POT).  They are used in radio, T.V. Tape-Recorders as a volume control or Tone Control. Sometimes these controls are attached with on/off Switch to control power.

Resistor's value is determined by the color code on them, to know How to calculate the resistor value click here

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Decoding Resistor Color Codes

Resistor: What actually did you mean by the resistor? (Resistor are the electronics component which are used to resist the flow of current or voltage in an electrical circuits.)
They are used in every electronics circuit.

So every resistor has its own value, printed in the form of color on it. Every color indicate one value and we have to decode it. In this post i am going to show you how to decode the resistor color code.

The image given below is of resistor, u can note the color on it.

This color are nothing but its resistance, this color will help to calculate the resistance.


Figure 1

Resistor

Table 1 Resistor Color Coding

                         

Color	1st Digit	2nd Digit	Multiplier	Tolerance
Black	0	0	1	+20%
Brown	1	1	10	+1%
Red	2	2	100	+2%
Orange	3	3	1,000	+3%
Yellow	4	4	10,000	+4%
Green	5	5	100,000	n/a
Blue	6	6	1,000,000	n/a
Violet	7	7	10,000,000	n/a
Gray	8	8	100,000,000	n/a
White	9	9	n/a	n/a
Gold			0.1	+5%
Silver			0.01	+10%

Referring to Table 1 and Figure 1, 

                Red represents 2 and Blue stands for 6, so the significant digits of a resistor with a Red-Blue-Green-Gold band scheme are 26. The third band indicates the multiplier, in this example that band is Green, so the value is 100,000. Multiply 26 by 100,000 and you get 2600000 ohms. You express values over 1000 ohms as 1 K-ohms and 1000 K-ohms as 1 M-ohms, so you say that the above resistor has a value of 2.6M-ohm.

And at last the Gold color indicate tolerance rate (for example, +5-percent tolerance means the resistor value may vary plus or minus 5 percent from the stated value).

Convertion Table:

1] 1 Mega ohms = 1000 Kilo ohms.

2] 1 Kilo ohms   = 1000 Ohms.

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