BASIC DC CIRCUIT CALCULATIONSBasic DC TheoryResistanceinParallelTotal resistance in a parallel circuit can be found by applying Ohm’s Law. Divide the voltageacross the parallel resistance by the total line current as shown in equation (2-9).(2-9)RTVITExample: Find the total resistance of the circuit shown in Figure 25 if the line voltage is120 V and total current is 26A.RTVIT120264.62 WThe total load connected to a 120 V source is the same as the single "equivalent resistance" of4.62W connected across the source (Figure 26). Equivalent resistance is the total resistance acombination of loads present to a circuit.Figure 26 Equivalent Resistance in a Parallel CircuitES-02 Page 32 Rev. 0
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