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Table 7-1.  DC Relationships
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Alternating Current
TM 9-254 7-2. Direct Current - Continued (2) The general formula for any number of unequal value resistors in parallel is: Figure 7-3.  Parallel Circuit (3) There are several special cases regarding parallel resistances. (a) The first case relates to a circuit with only two unequal value resistors in parallel. In this case the equivalent resistance can be found by dividing the product of the two resistors by their sum. This is stated mathematically as follows: RT = R1 R2 R1 +  R2 (b) The second special case  involves  any  number  of  equal  value  resistors  in  parallel.  The  equivalent resistance is found by dividing the resistance of one resistor by the number of resistors in parallel or: RT = R n Where: RT is the equivalent resistance. R is the resistance value of each resistor. n is the number of resistors in parallel. 7-3

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