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# Physical Properties of Coil – Calculating Physical Properties

calculating physical properties such as length, diameter, resistance, number of windings etc can be a complex task but it has been made easy with this calculator. This is an efficient electrical engineering tool.

## Physical Properties

### To calculate Physical Properties of Coil:

• Wire Diameter

mm

• Number Of Turns

turns

• Bobbin Length

mm

• Bobbin Diameter

mm

• Current (I)

A

•

• Turns per Winding

• Number of Windings

• Coil Diameter

(mm)2

• Cross sectional Area

(mm)2

• Total Length of Wire in Coil

m

• Resistance/meter

ohms/m

• Resistance

ohms

• Voltage at Rated Current

V

• Power at Rated Current

W

Formula:

T = bl / d
n = Turns/ T
cd = (2 x n x d) + bd
r = (n x d + bd) / 2
a = PI x r x r
L = (2 x PI x r x n) / 1000
rpm = .0333 *((0.812/2)*(0.812/2))/((d/2)*(d/2))
R = rpm x L
V = R x I
P = V x I

Where,
T = Turns per winding,
bl = Length of Bobbin,
d = Wire Diameter,
n = Number of windings,
cd = Outer diameter of coil,
bd = Diameter of Bobbin,
r = radius of middle of 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,

calculating physical properties such as length, diameter, resistance, number of windings etc can be a complex task but it has been made easy with this calculator. This is an efficient electrical engineering tool