This video walks through how to calculate the SMA of a conductor such as a busbar and then teaches you how to convert between CMA and SMA and vice versa.
it's π /4 Here's the derivation - Let's calculate the cross sectional area of a circle with a diameter, d, of 1 mil Start with the formula for area of a circle A = π r² R can be represented by diameter as d/2. Substitute d/2 for "r" in the area formula A = π (d/2)² = π/4 x d² Again, we have the value of d as 1mil A = π /4 * (1mil)² By definition, 1 circular mil (1cmil) is the area of a circle having diameter of 1 mil. Which means we can set the preceding statement equal to 1cmil A = π /4 * (1mil)² = 1cmil simplifying pi/4 results in: .7854 mil² = 1cmil Which is a ratio. This video gives you the "formula" where you plug sma into the sma literal and get the result For example "1 foot = 12 inches" is a ratio, not the formula to convert feet to inches
Where do you get the .7854 from?
it's π /4
Here's the derivation -
Let's calculate the cross sectional area of a circle with a diameter, d, of 1 mil
Start with the formula for area of a circle
A = π r²
R can be represented by diameter as d/2. Substitute d/2 for "r" in the area formula
A = π (d/2)² = π/4 x d²
Again, we have the value of d as 1mil
A = π /4 * (1mil)²
By definition, 1 circular mil (1cmil) is the area of a circle having diameter of 1 mil. Which means we can set the preceding statement equal to 1cmil
A = π /4 * (1mil)² = 1cmil
simplifying pi/4 results in:
.7854 mil² = 1cmil
Which is a ratio. This video gives you the "formula" where you plug sma into the sma literal and get the result
For example "1 foot = 12 inches" is a ratio, not the formula to convert feet to inches