Calculations
Sheet resistance is applicable to two-dimensional systems in which thin films are considered as two-dimensional entities. When the term sheet resistance is used, it is implied that the current flow is along the plane of the sheet, not perpendicular to it.
In a regular three-dimensional conductor, the resistance can be written as
where is the resistivity, is the cross-sectional area and is the length. The cross-sectional area can be split into the width and the sheet thickness .
Upon combining the resistivity with the thickness, the resistance can then be written as:
where is the sheet resistance. If the film thickness is known, the bulk resistivity (in ohm cm) can be calculated by multiplying the sheet resistance by the film thickness in cm.
Read more about this topic: Sheet Resistance
Famous quotes containing the word calculations:
“Nowhere are our calculations more frequently upset than in war.”
—Titus Livius (Livy)
“Now, since our condition accommodates things to itself, and transforms them according to itself, we no longer know things in their reality; for nothing comes to us that is not altered and falsified by our Senses. When the compass, the square, and the rule are untrue, all the calculations drawn from them, all the buildings erected by their measure, are of necessity also defective and out of plumb. The uncertainty of our senses renders uncertain everything that they produce.”
—Michel de Montaigne (1533–1592)
“Heaven’s calculations don’t follow man’s calculations.”
—Chinese proverb.