Basic DC Theory BASIC DC CIRCUIT CALCULATIONSFigure 21 Example 1 Series CircuitSolution:Step 1: Find circuit current. As we already know, current is the same throughout a seriescircuit, which is already given as 0.5 amps.Step 2: Find RT.RT = R1 + R2 + R3RT = 50 W + 75 W + 100 WRT = 225 WStep 3: Find VT. Use Ohm’s law.VT = IRTVT = (0.5 amps)(225 W)VT = 112.5 voltsExample 2: A 120 V battery is connected in series with three resistors: 40W, 60W, and 100W(Figure 22). Find the voltage across each resistor.Rev. 0 Page 27 ES-02
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