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In the figure, R1 = 10.0 ohms, R2 = 50.0 ohms, and R3 = 25.0 ohms. If a current of I2 = 0.128 A flows through resistor R2:
1) Find the voltage drop across the resistor R2
2) Find the voltage drop and current for resistor R1
3) Find the voltage drop and current for resistor R3
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Added Thu, 23 Jul '15
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1)
voltage drop across R2= R2*I2
                      =50* 0.128
                        =6.4 v
2)
voltage drop across R1= voltage drop across R2= 6.4 V
Because R1 and R2 are in parallel

3)
I1= V1/R1
    =6.4/10
    =0.64 A
I3= I1+I2
   = 0.64+ 0.128
=0.768 A
voltage drop across R3= R3*I3
                            =25 * 0.768
                               =19.2 v
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Added Thu, 23 Jul '15
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