Circuit Notes Series Circuits 1 Fill all of

Circuit Notes:

Series Circuits 1. Fill all of the R values into the chart. R 1 = 10 ohms S R 3 = 30 ohms I R R 1 10 R 2 20 R 3 30 Vt = 30 V R 2 = 20 ohms V T

Series Circuits 2. Calculate Rt 3. Plug in Vt R 1 = 10 ohms 4. 4. Calculate It S V I R 1 Vt = 30 V R 2 = 20 ohms R 2 R 3 = 30 ohms T 30. 5 R 10 20 30 60

In series circuits, I’s are all equal. Series Circuits 5. Plug in I’s R 1 = 10 ohms 6. Calculate Voltage Drops 7. Check to make sure they add up to Vt! Vt = 30 V R 2 = 20 ohms S R 1 R 2 R 3 = 30 ohms R 3 T V 5 10 15 30 I. 5. 5 R 10 20 30 60

Parallel Circuits P V R 1 R 2 R 3 Vt = 30 V R 1 = 10 ohms R 2 = 30 R 3 = 60 ohms T 1. Fill in R’s 2. 2. Calculate Rt remember to calculate the reciprocals! I R 20 30 60 10

Parallel Circuits n 1/Rt = 1/R 1 + 1/R 2 + 1/R 3 n 1/Rt = 1/20 + 1/30 + 1/60 n 1/Rt = 3/60 + 2/60 + 1/60 = 6/60 n Rt = 60/6 = 10 ohms!

Parallel Circuits P V I R 1 R 2 R 3 T Vt = 30 V R 1 = 20 ohms R 2 = 30 R 3 = 60 ohms 30 3 3. Plug in Vt 4. 4. Calculate It (ohm’s Law!) R 20 30 60 10

Parallel Circuits P R 1 R 2 R 3 Vt = 30 V R 1 = 20 ohms R 2 = 30 R 3 = 60 ohms T V I R 30 1. 5 2 0 30 1 3 0 30. 5 6 0 30 3 1 0 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!

1. Find the resistor farthest from the power source. Determine if it is Parallel or series. Combination Circuits R 1 = 10 ohms 2. If it is parallel: 2. Set up a parallel box. 3. Calculate Rp Vt = 120 V R 2 = 20 ohms R 3 = 20 ohms 4. (remember reciprocals!) P R 4 = 40 ohms V I R R 3 20 R 2 20 Rp 10

Combination Circuits Find series resistiors. 4. Set up Series box. 5. 5. Calculate Rt. R 1 = 10 ohms S V I R 1 Rp Vt = 120 V R 2 = 20 ohms R 3 = 20 ohms R 4 T R 10 10 40 60 R 4 = 40 ohms P Effective Circuit: Parallel resistors combined act as a single series resistor R 3 R 2 Rp V I R 20 20 10

Combination Circuits S R 1 = 10 ohms R 1 Rp R 4 Vt = 120 V R 2 = 20 ohms R 3 = 20 ohms T V 20 20 80 120 I 2 2 6. Plug in Vt. R 4 = 40 ohms 7. Calculate It P R 3 R 2 Rp V I R 20 20 10 8. Series I’s are the same! 9. 8. Plug in I’s 10. 9. Calculate V’s R 10 10 40 60

Combination Circuits S R 1 = 10 ohms Rp R 4 R 2 = 20 ohms R 4 = 40 ohms P R 3 R 2 Rp V 20 20 20 R 3 = 20 ohms T V 20 20 80 120 I 2 2 10. Substitute the Rp row into the Parallel box. I 1 1 2 R 20 20 10 11. V’s are equal in a parallel circuit. 11. Plug in V’s 12. Calculate I’s 13. Your done! R 10 10 40 60