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 R_{T}.R_{T} = R_{1} + R_{2} + R_{3}R_{T} = 50 W + 75 W + 100 WR_{T} = 225 WStep 3: Find V_{T}. Use Ohm’s law.V_{T} = IR_{T}V_{T} = (0.5 amps)(225 W)V_{T} = 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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