Datasheet

Kanthal Appliance Alloys Handbook 73
10
3. Formulas for Values in Chapter 9, Tables
A
C/m
= 2 · (
b + t) · 10
In the Kanthal handbook values per meter
of the material in each dimension are calcu-
lated and presented in the table as surface
area, weight, resistance.
Furthermore are the cross sectional area
and area /Ω calculated.
Below you can see formulas used (formulas
include the unit correction)
Metric units:
Cross sectional area q [mm
2
]
Based on equation [12] [14] res. [15]
Wire
[8’]
Strip
Ribbon
Surface area per meter A
C/m
[cm
2
/m]
Based on equation [7] res. [8]
Wire
Strip/Ribbon
Weigth per meter, m
m
[g/m]
Wire
m = volume · γ = q · l · γ ➔ m
m
= q · γ
Strip
Ribbon
Wire
Resistance per meter R
20/m
[Ω/m]
Based on equation [1]
Ribbon
Wire
Strip
[12’]
π
4
· d
2
q =
[14’]
q = b · t
[15’]
q = 0.92 · b · t
[7’]
A
C/m
= π
· d · 10
[18]
π · d
2
· γ
4
m
m
=
[18]
m
m
= b · t · γ
[18]
m
m
= 0.92 · b · t · γ
[1’]
ρ
q
R
20/m
=
[1’]
ρ · 4
π · d
2
R
20/m
=
[1’]
R
20/m
=
b · t
ρ
[1’]
R
20/m
=
0.92 · b · t
ρ