Basic Circuit Analysis
This formal equation for the total resistance of a parallel circuit looks horribly complicated ... at least at first glance. In the days of pencil-and-paper calculation, this equation was generally considered impossible to use. With today's calculator technology, the 1/x function key renders the process of solving the parallel resistance equation fairly straightforward.
Suppose there is a parallel resistor circuit with values of 10W, 15W, and 25W.
4. Present the solution:
Endless Examples & Exercises
In practical electronic design and troubleshooting, it is sometimes necessary to adjust the total resistance of a parallel circuit. Suppose, for instance, a circuit is a simple 180W resistor. For some good reason, you fine it necessary to lower the resistance to 120W by adding another resistor in parallel. The problem, of course, is to determine the value of that resistor.
Using the product-over-sum equation, you are given the desired total resistance (RT) and the value of one of the two resistors (R1). Solve the equation for R2.
Some Notes About Parallel Resistance
|David L. Heiserman, Editor||
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Revised: June 06, 2015