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# Resistance Calculator

This calculator will convert the colour codes to resistance values and calculate the overall serial or parallel circuit resistance.

To Calculate:

Number of Bands:

 1st Band Color: black brown red orange yellow green blue violet grey white 2nd Band Color: black brown red orange yellow green blue violet grey white 3rd Band Color: black brown red orange yellow green blue violet grey white Multiplier Color: black brown red orange yellow green blue violet grey white gold silver Tolerance Color: brown red orange yellow green blue violet grey gold silver Temperature Coefficient Color: black brown red orange yellow green blue violet grey

Provide all of the resistance values in series separated by a comma:

Length:

Diameter:

Material:

Conductivity:

S/m

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This ohm resistance calculator will readily calculate resistance and tolerance of an electrical circuit based on colour codes. Also computes conductorâ€™s resistance based on conductivity and size values entered. Moreover, you could estimate the combined series or parallel resistance with the tool.

## What Is Resistance?

Something that forces the electric current not to flow is known as the resistance.

### How To Calculate Resistance?

Following are the standard voltage current resistance formulas to measure resistance:

#### Colour Codes:

Colour codes correspond to the ratings that define the potential of certain electrical components. But we have considered the codes for resistances only.

• Hold the resistance in your hand with tolerance bands to the most right
• Start noticing bands one by one from left to right and pick a value from the table (against colour) to estimate the desired ohm value.

For instance, the following pictures will let you understand pattern to calculate ohm value that you are holding:

##### 3 Band Resistor:4 Band Resistor:5 Band Resistor:6 Band Resistor:

Our electrical resistance calculator takes into account the table below to decode the colour code into value:

Color 1st, 2nd, 3rd
Band Significant Figures
Multiplier Tolerance Temperature Coefficient
Black 0 Ã— 1 250 ppm/K (U)
Brown 1 Ã— 10 Â±1% (F) 100 ppm/K (S)
Red 2 Ã— 100 Â±2% (G) 50 ppm/K (R)
Orange 3 Ã— 1K Â±0.05% (W) 15 ppm/K (P)
Yellow 4 Ã— 10K Â±0.02% (P) 25 ppm/K (Q)
Green 5 Ã— 100K Â±0.5% (D) 20 ppm/K (Z)
Blue 6 Ã— 1M Â±0.25% (C) 10 ppm/K (Z)
Violet 7 Ã— 10M Â±0.1% (B) 5 ppm/K (M)
Grey 8 Ã— 100M Â±0.01% (L) 1 ppm/K (K)
White 9 Ã— 1G
Gold Ã— 0.1 Â±5% (J)
Silver Ã— 0.01 Â±10% (K)
None Â±20% (M)

#### Serial Resistance:

$$R_{total} = R_{1}+R_{2}+R_{3}+R_{4}+R_{5}+…+R_{n}$$

#### Parallel Resistance:

$$R_{total} = \dfrac{1}{\dfrac{1}{R_{1}}+\dfrac{1}{R_{2}}+\dfrac{1}{R_{3}}+\dfrac{1}{R_{4}}+\dfrac{1}{R_{5}}+…+\dfrac{1}{R_{n}}}$$

#### Conductor Resistance:

$$R = \dfrac{L}{A*C}$$

where;

L = Length of Conductor
A = Cross Sectional Area of the Conductor
C = Materialâ€™s Conductivity

### How Does Our Circuit Resistance Calculator Work?

Calculating resistance with our calculator is quite easy and swift. Letâ€™s learn its usage!

Input:

• Please select the resistance method from the top list there on tool
• Once you are done with your choice, go by entering the values or selecting colour combinations for your resistances
• Hit the calculate button

Output:

• Resistance calculations for conductors and circuits

## References:

From the source of Wikipedia: Electrical resistance and conductance, Ohm’s law, Static and differential resistance, AC circuits, Energy dissipation and Joule heating

From the source of Khan Academy: Current, do electrons in alternating current circuits

From the source of Coursehero: Resistors, Temperature and Superconductivity, Resistivity