## Resistor Resistors act as the most common passive components in circuits.

For example, a resistor can be used to limit the current through a LED. In the example circuit given below, we can calculate the value of resistance by simple calculation as given below.

V_PWR-V_RESISTOR-V_LED=0

V_PWR-(I_LED*RESISTANCE VALUE)-V_LED =0

[Samples values => V_PWR=5V; I_LED=20mA; V_LED = 3V(typical forward voltage for blue LED)]

5-(0.02*RESISTANCE VALUE)-3=0

Which gives => RESISTANCE VALUE = 100 Ohm

In this case the power rating of the resistance also matter. Power rating of resistance is calculated below.

Power = (Square of Current) * (Resistance value)

Power = (0.02*0.02)*(100) = 0.04 Watt #### 10K-TH1/4W-5%

10 kilo ohm through-hole resistance in 1/4W package, with 5% tolerance...

Rs. 0.25

#### 120K-TH1/8W-5%

120 killo ohm through hole resistance in 1/8W package, with 5% tolerance...

Rs. 0.15

#### 12R-SMD1206-5%

12 Ohm SMD resistance in 1206 package, with 5% tolerance...

Rs. 0.20

#### 15K-SMD1206-5%

15 Kilo Ohm SMD resistance in 1206 package, with 5% tolerance...

Rs. 0.20

#### 15K-TH1/8W-5%

15 killo ohm through hole resistance in 1/8W package, with 5% tolerance...

Rs. 0.15

#### 180K-SMD1206-5%

180 kilo Ohm SMD resistance in 1206 package, with 5% tolerance...

Rs. 0.20

#### 270R-SMD1206-5%

270 Ohm SMD resistance in 1206 package, with 5% tolerance...

Rs. 0.20

#### 470R-SMD0805-5%

470 Ohm SMD resistance in 0805 package, with 5% tolerance...

Rs. 0.20

#### 4K7-SMD0805-5%

4.7 Kilo Ohm SMD resistance in 0805 package, with 5% tolerance...

Rs. 0.20

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