Presentation is loading. Please wait.

Presentation is loading. Please wait.

Equivalent Resistance Series and Parallel Circuits.

Similar presentations


Presentation on theme: "Equivalent Resistance Series and Parallel Circuits."— Presentation transcript:

1 Equivalent Resistance Series and Parallel Circuits

2 Two Kinds of circuits

3 Circuit Diagrams When drawing pictures of circuits, symbols are used as shorthand instead of pictures of components.

4 Circuit Diagrams Instead of a battery, the symbol is used. (Note: sometimes voltage is called emf or potential difference)

5 Circuit Diagrams Instead of a resistor, the symbol is used.

6 Circuit Diagrams Resistors and batteries will be labeled with their respective values most of the time. 9V 10 Ω

7 Practice Draw a series circuit with a 5V battery and two resistors (one 3Ω and the other 5Ω)

8 Practice Draw a series circuit with a 5V battery and two resistors (one 3Ω and the other 5Ω) 5V 3 Ω 5 Ω

9 Practice Draw a parallel circuit with a 12V battery and two resistors (one 6Ω and the other 2Ω)

10 Practice Draw a parallel circuit with a 12V battery and two resistors (one 6Ω and the other 2Ω) 12V 6 Ω2 Ω

11 Using Ohm’s Law (V=IR) Ohm’s Law can be applied to A) the WHOLE circuit or B) each RESISTOR separately

12 Ohm’s Law- WHOLE Circuit What is R total for the circuit? What is the current? 5V 3 Ω 5 Ω

13 Ohm’s Law- WHOLE Circuit R total : I: 5V 3 Ω 5 Ω

14 Ohm’s Law- EACH Resistor What is the voltage in each resistor? 5V 3 Ω 5 Ω

15 Ohm’s Law- EACH Resistor What do we know about the current in each resistor? 5V 3 Ω 5 Ω

16 Ohm’s Law- EACH Resistor What do we know about the current in each resistor? 5V 3 Ω 5 Ω

17 Ohm’s Law- EACH Resistor With that in mind we can solve for voltage. 3Ω resistor5Ωresistor 5V 3 Ω 5 Ω

18 Ohm’s Law- EACH Resistor With that in mind we can solve for voltage. 3Ω resistor5Ωresistor 5V 3 Ω 5 Ω

19 Ohm’s Law- EACH Resistor With that in mind we can solve for voltage. 3Ω resistor5Ωresistor 5V 3 Ω 5 Ω

20 Ohm’s Law- EACH Resistor Double check your answer to be sure. 3Ω resistor5Ωresistor 5V 3 Ω 5 Ω

21 Summary- SERIES Circuits We can write the ways we used Ohm’s Law as: WholeResistor 1, Resistor 2, Resistor3, … Circuit

22 Practice Pg. 650 Practice A

23 Ohm’s Law for PARALLEL circuits

24 PARALLEL (WHOLE circuit) First, let’s look at Total Resistance 10V 2 Ω4 Ω

25 PARALLEL (WHOLE circuit) 10V 2 Ω4 Ω

26 PARALLEL (WHOLE circuit) Now we can apply Ohm’s Law (V=IR) to the whole circuit: V=10VR total =1.33ΩI=? V=IR → 10V=I(1.33Ω) I=7.51A 10V 2 Ω4 Ω

27 PARALLEL (EACH resistor) Now lets look at the VOLTAGE in each resistor. 10V 2 Ω4 Ω

28 PARALLEL (EACH resistor) How much voltage will an electron use up going through this resistor? 10V 2 Ω4 Ω

29 PARALLEL (EACH resistor) How about this one? 10V 2 Ω4 Ω

30 PARALLEL (EACH resistor) Since the VOLTAGE is the same in each resistor 10V 2 Ω4 Ω

31 PARALLEL (EACH resistor) Now use V=IR to solve for current at each resistor: 2Ω resistor4Ω resistor 10V 2 Ω4 Ω V= 10V

32 PARALLEL (EACH resistor) Total Circuit: V=10VR total =1.33ΩI=7.51A Compare the currents 2Ω resistor4Ω resistor 10V 2 Ω4 Ω V= 10V Equal +

33 Summary of Ohm’s Law For PARALLEL circuits: V total =V 1 =V 2 =V 3 =… I total =I 1 +I 2 +I 3 +… 10V 2 Ω4 Ω

34 Practice Pg. 655 Practice B


Download ppt "Equivalent Resistance Series and Parallel Circuits."

Similar presentations


Ads by Google