# Physical Properties of Coil

Determine resistance, total wire length, and number of windings.

Utilize this online electrical calculator to compute the physical characteristics of a coil or material, including resistance, total wire length, and number of windings. The calculator assumes the wire to be copper when calculating resistance and voltage.

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Number of calculations

T = \frac{bl}{d}

n = \frac{\text{Turns}}{T}

cd = (2 \cdot n \cdot d) + bd

r = \frac{n \cdot d + bd}{2}

a = \pi \cdot r \cdot r

L = \frac{2 \cdot \pi \cdot r \cdot n}{1000}

\text{rpm} = 0.0333 \cdot \frac{(\frac{0.812}{2})(\frac{0.812}{2})}{(\frac{d}{2})(\frac{d}{2})}

R = \text{rpm} \cdot L

V = R \cdot I

P = V \cdot I

**Where**,

- T = Turns per winding,
- bl = Length of Bobbin,
- d = Wire Diameter,
- n = Number of windings,
- cd = Outer diameter of the coil,
- bd = Diameter of Bobbin,
- r = radius of the middle of the coil,
- a = Cross-sectional area,
- L = Total Length,
- rpm = Resistance/meter,
- R = Resistance,
- V = Voltage at Rated Current,
- I = Current,
- P = Power at Rated Current,