—
1
—
Problem.
Battery
We will insist on the importance of units in engineering applications. Dimensions indicated by
numbers depend on the corresponding units: 1 meter = 100 centimeter, but 1 does not equal 100.
The number and the unit are inseparable, at least in principle! Writing 1 meter rather than 1 is called
”carrying the unit.” As a general rule, units should be carried in all engineering computations. In
working out equations, the units are treated as algebraic quantities.
It is best to work out the
equations in symbolic form. Each symbol is replaced by its number and unit only at the very end.
In addition to being important for applications in the real world, keeping track of units is a powerful
way to check that an answer is at least consistent with the expected outcome. Getting the units right
does not guarantee that the answer is right, but getting them wrong is a clear indication of difficulty.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '07
 BERMAN

Click to edit the document details