4. Kirchhoff’s Current Law For a series circuit: In a series circuit there is only one path so the current must be… Kirchhoff’s Current Law For a series circuit: In a series circuit there is only one path so the current must be…

5. For a parallel circuit: In a parallel circuit the charge can take different paths. Therefore the amount of charge at any point… For a parallel circuit: In a parallel circuit the charge can take different paths. Therefore the amount of charge at any point…

8. V T = V 1 + V 2 + V 3 …

9. V T = V 1 = V 2 = V 3 …

10. R T = R 1 + R 2 + R 3 …

11. 1 = 1 + 1 + 1 … R T R 1 R 2 R 3

13. Example A series circuit is shown to the left. a) What is the total resistance? b) What is the total current? c) What is the current across EACH resistor? d) What is the voltage drop across each resistor?( Apply Ohm's law to each resistor separately) R(series) = 1 + 2 + 3 = 6   V=IR 12=I(6) I = 2A They EACH get 2 amps! V 1   2 VV 3  =(2)(3)= 6VV 2  =(2)(2)= 4V Notice that the individual VOLTAGE DROPS add up to the TOTAL!!

14. Example To the left is an example of a parallel circuit. a) What is the total resistance? b) What is the total current? c) What is the voltage across EACH resistor? d) What is the current drop across each resistor? (Apply Ohm's law to each resistor separately) 2.20  3.64 A 8 V each! 1.6 A1.14 A0.90 A Notice that the individual currents ADD to the total.