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Figure 22    Example 2 Series Circuit
Figure 23    Example 1 Parallel Circuit

Electrical Science Volume 1 of 4
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Basic DC Theory BASIC DC CIRCUIT CALCULATIONS Step 3: Find the voltage across each component. V1 = IR1 V1 = (0.6 amps)(40 W) V1 = 24 volts V2 = IR2 V2 = (0.6 amps)(60 W) V2 = 36 volts V3 = IR3 V3 = (0.6 amps)(100 W) V3 = 60 volts The voltages of V1, V2, and V3 in Example 2 are known as "voltage drops" or "IR drops."  Their effect is to reduce the available voltage to be applied across the other circuit components.   The sum of the voltage drops in any series circuit is always equal to the applied voltage.   We can verify our answer in Example 2 by using equation (2-4). VT V1 V2 V3 120  volts 24  volts 36  volts 60  volts 120  volts 120  volts Parallel Currents The sum of the currents flowing through each branch of a parallel circuit is equal to the total current  flow  in  the  circuit.    Using  Ohm’s  Law,  the  branch  current  for  a  three  branch  circuit equals the applied voltage divided by the resistance as shown in equations (2-6), (2-7), and (2-8). Branch 1: (2-6) I1 V1 R1 V R1 Branch 2: (2-7) I2 V2 R2 V R2 Branch 3: (2-8) I3 V2 R2 V R2 Example 1: Two resistors, each drawing 3A, and a third resistor, drawing 2A, are connected in parallel across a 115 volt source (Figure 23).   What is total current? Rev. 0 Page 29 ES-02







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