Enter the resistivity, length of the wire, and the diameter of the wire into the calculator to determine the nichrome resistance.

## Nichrome Resistance Formula

The following formula is used to calculate the resistance of a nichrome wire.

R = p*L / A

• Where R is the resistance (ohms)
• p is the resistivity of nichrome (150*10^-8 (ohm-meters))
• L is the length of the wire (m)
• A is the cross-sectional area of the wire (m^2)

To calculate the resistance of a nichrome wire, multiply the resistivity by the length, then divide by the cross-sectional area of the wire.

## What is the resistance of nichrome?

Definition:

Nichrome material has a resistivity of 150*10^-8 ohm-meters, so the total resistance will be determined by the diameter and the length of the wire.

## How to calculate nichrome resistance?

Example Problem:

The following example outlines how to calculate the resistance of a nichrome wire.

First, determine the resistivity of nichrome. This is a known value of 150 * 10^-8 ohm-meters.

Next, determine the length of the wire. This wire is 100m long.

Next, determine the cross-sectional area of the wire. Given a diameter of the wire of .025m, the cross-sectional area can be calculated with the formula:

pi*D^2/4 = 3.14159*.025^2/4 = .00049 m^2

Finally, calculate the total resistance using the formula above:

R = p*L / A

R = (150*10^-8)*100 / .00049

R = .306 ohms