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Determine the rms voltage across: each
resistor and the rms current in the circuit
above. The source voltage is given as an
rms value.
The total resistance of the circuit is 
RT = 
R1 + R2

 
 
 
 
 
 
 
                            =
 1.0kΩ + 560Ω

 
 
 
 
 
 
 
                            =
 1.56 kΩ
I rms
 =
Vrms / RT

     =
 110 / (1.56 x 103)

     =
 70.5 x10-3


     =
 70.5 mA
For R1:
V1 
 = 
I x R1



          =
 70.5mA x 1.0kΩ



          =
 (70.5x 10-3) x (1.0 x 103)




          =
 70.5 V
For R2:
V2 
 =
 I x R2



          = 
(70.5x 10-3) x (.56 x 103)



          =
 39.5 V

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1.7.5 Example 3

  • 1. Determine the rms voltage across: each resistor and the rms current in the circuit above. The source voltage is given as an rms value.
  • 2. The total resistance of the circuit is RT = R1 + R2 = 1.0kΩ + 560Ω = 1.56 kΩ
  • 3. I rms = Vrms / RT = 110 / (1.56 x 103) = 70.5 x10-3 = 70.5 mA
  • 4. For R1: V1 = I x R1 = 70.5mA x 1.0kΩ = (70.5x 10-3) x (1.0 x 103) = 70.5 V For R2: V2 = I x R2 = (70.5x 10-3) x (.56 x 103) = 39.5 V