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Parallel Circuits

Parallel Circuits. I. _. I 1. I 2. V. R. +. I. Parallel Circuits. R. Parallel Circuit Rules. A parallel circuit has two or more paths for current to flow through. Voltage is the same across each component of the parallel circuit. V S = V 1 = V 2 = V 3 … . Parallel Circuit Rules.

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Parallel Circuits

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  1. Parallel Circuits

  2. I _ I1 I2 V R + I Parallel Circuits R

  3. Parallel Circuit Rules A parallel circuit has two or more paths for current to flow through. Voltage is the same across each component of the parallel circuit. VS = V1 = V2 = V3… 

  4. Parallel Circuit Rules The sum of the currents through each path is equal to the total current that flows from the source.  IT = I1 + I2 + I3…

  5. VT V1 V2 V3 RT R1 R2 R3 = + + Let’s find the total Resistance IT = I1 + I2 + I3… Use V and R to find I:

  6. VT V1 V2 V3 RT R1 R2 R3 1 1 1 1 RT R1 R2 R3 = = + + + + Use: VS = V1 = V2 = V3

  7. Parallel Circuit Rules The Total Resistance of a Parallel Circuit is always less than the smallest resistor. 

  8. IT _ I1 I2 I3 V R1 R2 R3 + Example IT

  9. Given: V = 36V R1 = 6 Ω R2 = 9 Ω R3 = 18 Ω Example Find: RT = ? I1 = ? I2 = ? I3 = ?

  10. IT _ I1 I2 I3 V R1 R2 R3 + Example IT

  11. Given: V = 120V R1 = 30k Ω R2 = 30k Ω R3 = 30k Ω Example Find: RT = ? I1 = ? I2 = ? I3 = ?

  12. RkΩ ImA VV PmW Comp 1 2 3 Total 30 4 120 480 480 30 4 120 120 30 4 480 10 12 120 1440

  13. IT _ I1 I2 I3 V R1 R2 R3 + Example IT

  14. Given: R1 = 6Ω IT = 10mA I2 = 3mA I3 = 2mA Example Find: RT = ? VT = ? II = ? R2 = ? R3 = ?

  15. RkΩ ImA VV PmW Comp 1 2 3 Total 6 5 30 150 90 10 3 30 30 15 2 60 3 10 30 300

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