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# Series and Parallel Circuits

Download Presentation ## Series and Parallel Circuits

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1. Series and Parallel Circuits

2. Circuits • Can either be series or parallel.

3. Series • Current only takes one path for electrons • Current flows through every part of the circuit

4. Lights in a Series

5. Series • If you add a resistor (like another light): • Total resistance goes UP since all the current has must go through each resistor.

6. Adding Resistors to Series: • Current in the circuit will go DOWN (lights will dim) • If you remove a light bulb or one burns out—all go out!

7. Current in Series • Current is the same at all points • Use Ohm’s Law to find current using resistance and voltage

8. Calculating Current Example:

9. Voltage in Series • Voltage is reduced by each resistance – voltage drop

10. Calculating Voltage Example

11. Resistance in Series • Add up all resistors to get total • Total resistance will go up because all of the current must go through each resistor.

12. Calculating Resistance Example:

13. Sample Problem #1 • Draw a series circuit with two 1.5 V batteries, 3 resistors, and a current of 0.5 A. • What is the total voltage of the circuit? • What is the resistance of each resistor? • What is the voltage drop across each resistor? Label on your circuit.

14. Parallel Circuits • Has at least one point where current divides • More than one path for current to flow • Paths are also known as branches

15. Lights in Parallel

16. Parallel: • If you add a resistor: • Total resistance goes down • Total current goes up when you add another path

17. Removing a Light Bulb • If you remove a light bulb or one burns out, the others stay on because the circuit is still closed.

18. Current in Parallel • Current flows into a branching point, the same total current must flow out again • Current depends on resistance in each branch

19. Calculating Current Example:

20. Voltage in Parallel • Voltage is the same across each branch – because each branch is on the same wire

21. Calculating Voltage Example:

22. Resistance in Parallel • Calculate current in each branch based on resistance in each branch by using Ohm’s Law

23. Calculating Resistance Example:

24. Practice problem #2 • Draw a parallel circuit with two resistors (one on each branch) and a 12 V battery. • What is the voltage through each resistor? • What is the current flowing through each branch?