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Resistance Formula

GoResistance of Wire Formula

GoResistance on Stretching of Wire Formula

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Electric resistance is the opposition to the flow of an electric current and is measured in ohms, representing how much a material hinders electric current flow. Check FAQs

R = \frac{ρ \cdot L conductor}{A}

R - Electric Resistance?ρ - Resistivity?L_conductor - Length of Conductor?A - Cross-Sectional Area?

Resistance Example

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Here is how the Resistance equation looks like with Values.

Here is how the Resistance equation looks like with Units.

Here is how the Resistance equation looks like.

15 = \frac{0.6 \cdot 350}{14}

15Ω = \frac{0.6Ω*mm \cdot 350mm}{14mm²}

15 = \frac{0.6 \cdot 350}{14}

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Resistance Solution

Follow our step by step solution on how to calculate Resistance?

FIRST Step Consider the formula

R = \frac{ρ \cdot L conductor}{A}

Next Step Substitute values of Variables

∴

R = \frac{0.6Ω*mm \cdot 350mm}{14mm²}

Next Step Convert Units

∴

R = \frac{0.0006Ω*m \cdot 0.35m}{1.4E-5m²}

Next Step Prepare to Evaluate

∴

R = \frac{0.0006 \cdot 0.35}{1.4E-5}

LAST Step Evaluate

∴

R = 15Ω

Resistance Formula Elements

Variables

Electric Resistance

Electric resistance is the opposition to the flow of an electric current and is measured in ohms, representing how much a material hinders electric current flow.

Symbol: R

Measurement: Electric ResistanceUnit: Ω

Note: Value can be positive or negative.

Formulas to find Electric Resistance

Resistivity

Resistivity is the opposition to the flow of electric current in a conductor, measured by the degree to which it resists the flow of electric charge.

Symbol: ρ

Measurement: Electric ResistivityUnit: Ω*mm

Note: Value can be positive or negative.

Formulas to find Resistivity

Length of Conductor

Length of Conductor is the distance between the two ends of a conductor through which electric current flows.

Symbol: L_conductor

Measurement: LengthUnit: mm

Note: Value can be positive or negative.

Formulas to find Length of Conductor

Cross-Sectional Area

Cross-Sectional Area is the area of a given cross-section of a conductor, which affects the flow of electric current through it.

Symbol: A

Measurement: AreaUnit: mm²

Note: Value should be greater than 0.

Formulas to find Cross-Sectional Area

Other Formulas to find Electric Resistance

Go Resistance of Wire

R = ρ \cdot \frac{L wire}{A wire}

Go Resistance on Stretching of Wire

R = \frac{Ω \cdot {L wire}^{2}}{{(L f,wire)}^{2}}

Go Temperature Dependence of Resistance

R = R ref \cdot (1 + α \cdot ∆T)

Other formulas in Resistance category

Go Equivalent Resistance in Parallel

R eq,parallel = {(\frac{1}{R} + \frac{1}{Ω})}^{- 1}

Go Internal Resistance using Potentiometer

r = \frac{L - l 2}{l 2} \cdot Ω

Go Resistivity of Material

ρ material = \frac{2 \cdot [Mass-e]}{n \cdot {[Charge-e]}^{2} \cdot 𝛕}

Go Equivalent Resistance in Series

R eq, series = R + Ω

How to Evaluate Resistance?

Resistance evaluator uses Electric Resistance = (Resistivity*Length of Conductor)/Cross-Sectional Area to evaluate the Electric Resistance, Resistance formula is defined as a measure of the opposition to current flow in an electrical circuit, which depends on the material of the conductor, its length, and its cross-sectional area, and is a fundamental property in understanding the behavior of electric circuits. Electric Resistance is denoted by R symbol.

How to evaluate Resistance using this online evaluator? To use this online evaluator for Resistance, enter Resistivity (ρ), Length of Conductor (L_conductor) & Cross-Sectional Area (A) and hit the calculate button.

FAQs on Resistance

What is the formula to find Resistance?

The formula of Resistance is expressed as Electric Resistance = (Resistivity*Length of Conductor)/Cross-Sectional Area. Here is an example- 38.57143 = (0.0006*0.35)/1.4E-05.

How to calculate Resistance?

With Resistivity (ρ), Length of Conductor (L_conductor) & Cross-Sectional Area (A) we can find Resistance using the formula - Electric Resistance = (Resistivity*Length of Conductor)/Cross-Sectional Area.

What are the other ways to Calculate Electric Resistance?

Here are the different ways to Calculate Electric Resistance-

Electric Resistance=Resistivity*Wire Length/Cross-Sectional Area of Wire
Electric Resistance=(Final Resistance*Wire Length^2)/((Final Length of Wire)^2)
Electric Resistance=Resistance at Reference Temperature*(1+Temperature Coefficient of Resistance*Change in Temperature)

Can the Resistance be negative?

Yes, the Resistance, measured in Electric Resistance can be negative.

Which unit is used to measure Resistance?

Resistance is usually measured using the Ohm[Ω] for Electric Resistance. Megohm[Ω], Microhm[Ω], Volt per Ampere[Ω] are the few other units in which Resistance can be measured.

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Resistance Formula

​GoResistance of Wire Formula

​GoResistance on Stretching of Wire Formula

Resistance Example

Resistance Solution

Resistance Formula Elements

Other Formulas to find Electric Resistance

Other formulas in Resistance category

How to Evaluate Resistance?

FAQs on Resistance

Variable Name

GoResistance of Wire Formula

GoResistance on Stretching of Wire Formula