Parallel Circuits R1 = 20 ohms R2 = 30 ohms R3 = 60 ohms Vt = 30V PVIR R R R T In a parallel circuit, all V’s are equal! 5.Fill in V’s. 6.Calculate I’s Check to make sure they add up to It!
Combination Circuits R1 = 10 ohms R4 = 40 ohms Vt = 120V R2 = 20 ohms R3 = 20 ohms 1.Find the resistor farthest from the power source. Determine if it is Parallel or series. If it is parallel: 2.Set up a parallel box. 3.Calculate Rp (remember reciprocals!) PVIR R3 20 R2 20 Rp 10
Combination Circuits PVIR R3 20 R2 20 Rp 10 R1 = 10 ohms R4 = 40 ohms Vt = 120V R2 = 20 ohms R3 = 20 ohms Find series resistiors. 4.Set up Series box. 5. Calculate Rt. SVIR R1 10 Rp 10 R4 40 T60 Effective Circuit: Parallel resistors combined act as a single series resistor
Combination Circuits SVIR R Rp R T R1 = 10 ohms R4 = 40 ohms R2 = 20 ohms R3 = 20 ohms Vt = 120V PVIR R3 20 R2 20 Rp 10 6.Plug in Vt. 7.Calculate It Series I’s are the same! 8. Plug in I’s 9. Calculate V’s
Combination Circuits SVIR R Rp R T R1 = 10 ohms R4 = 40 ohms R2 = 20 ohms R3 = 20 ohms PVIR R3 201 R2 201 Rp Substitute the Rp row into the Parallel box. V’s are equal in a parallel circuit. 11.Plug in V’s 12.Calculate I’s Your done!