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Section I.  BASIC LAWS AND FORMULAS
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Figure 7-3.  Parallel Circuit
TM 9-254 7-2. Direct Current - Continued d. DC Circuit Evaluation.  The four quantities (voltage, current, resistance, and power) are the basic quantities used in evaluating a DC circuit.  Table 7-1 provides a useful tool for determining the unknown values if any two of these quantities  are  known.    Enter  the  table  in  the  row  indicating  the  known  values.    Find  the  appropriate  formula(s)  for  the desired unknown(s) under the proper column heading. Table 7-1.  DC Relationships Known Formulas for Determining Unknown Values of Values I R E P I & R - - E = IR P = I2R I & E - R = I E - P = IE I & P - R = I P 2 E = I P - R & E I = R E - - P = R E2 R & P I =    R P - E =    PR - E & P I = E P R = P E2 - - e. Resistance.  Resistance is the opposition to the flow of current.  The total or equivalent resistance of a circuit is  dependent  on  how  the  resistors  are  connected.    Resistors  can  be  connected  in  series  as  shown  in  figure  7-2  or  in parallel as shown in figure 7-3.  The formulas for calculating series and parallel resistance are given below. (1) The equivalent resistance of a series circuit is the algebraic sum of all the resistors in the circuit.  This is stated mathematically as follows: Figure 7-2.  Series Circuit 7-2

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