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