Series and Parallel Circuits - PowerPoint PPT Presentation

series and parallel circuits n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Series and Parallel Circuits PowerPoint Presentation
Download Presentation
Series and Parallel Circuits

play fullscreen
1 / 30
Series and Parallel Circuits
1686 Views
Download Presentation
Rita
Download Presentation

Series and Parallel Circuits

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  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?

  25. Toll Road—Circuit Analogy

  26. Toll Booth Explanation • Adding toll booths in series increases resistance and slows the current flow. • Adding toll booths in parallel lowers resistance and increases the current flow.

  27. Batteries in Series and Parallel:

  28. In series—The voltage is increased. • In parallel—No change in voltage; these batteries will last longer!

  29. One More FINAL Thing: • Two Types of Current: • DC—Direct Current—produced by solar cells and chemical cells (batteries) • Current only flows in one direction.

  30. 2nd type of current: • AC—Alternating Current • Current flows back and forth (alternates) • Found in homes • Generators produce AC current