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Unformatted text preview: d, if one of the resistances, say R1, is very much smaller
than the other, the resistance of the whole circuit is almost equal to that
very small value, since most of the current will ow through that resistor and
avoid the other one. What if R1 is zero? The answer is intuitively clear: if one
resistor o ers no resistance to the current, all the current will ow through
that resistor and avoid the other one therefore, the total resistance in the
22 circuit is zero. The formula for T also makes perfect sense mathematically
we get
1
1
1
T = 1 + 1 = 1 + 1 = 1 = 0:
0 R2
R2
Why, then, should a programmer writing code for the evaluation of parallel
resistance formulas have to worry about treating division by zero as an exceptional situation? In IEEE oating point arithmetic, the programmer is
relieved from that burden. As long as the initial oating point environment
is set properly (as explained below), division by zero does not generate an
interrupt but gives an in nite result, program execution continuing normally.
In the case of th...
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This note was uploaded on 02/12/2014 for the course MATH 4800 taught by Professor Lie during the Spring '09 term at Rensselaer Polytechnic Institute.
 Spring '09
 LIE

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