1 / 21

Electric Circuits

Electric Circuits. Electric charges always move from high-voltage to low-voltage. Travels from negative to positive. [http://www.energyquest.ca.gov/story/images/chap04_circuit.gif]. Click Here for an Interactive Example. Electric Circuits.

mab
Download Presentation

Electric Circuits

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Electric Circuits • Electric charges always move from high-voltage to low-voltage. • Travels from negative to positive [http://www.energyquest.ca.gov/story/images/chap04_circuit.gif] Click Here for an Interactive Example

  2. Electric Circuits • Voltage difference “forces” charges along a conductor and is measured in volts (V) • Also called potential difference [http://www.speedysigns.com/images/osha/large/DANGER54.gif]

  3. Water Tower analogy for Voltage [http://www.bcae1.com/images/gifs/voltage1.gif]

  4. Common Error About Voltage… phttp://www.cartoonstock.com/newscartoons/cartoonists/ksm/lowres/ksmn1044l.jpg[

  5. Electric Circuits • Electric Current is the flow of charges (electrons) and is measured in amperes (A). [http://www.heirloomradio.com/images/coulomb.jpg]

  6. [http://www.smud.org/safety/world/hurt/media/current_chart.gif][http://www.smud.org/safety/world/hurt/media/current_chart.gif]

  7. Electric Circuits • Resistance is the tendency for materials to oppose the flow of electrons. • Electrical energy is commonly changed into heat, light, or motion. [http://www.energyquest.ca.gov/story/images/chap04_circuit.gif]

  8. Electric Circuits • Resistance is measured in ohms (Ω). Click here for a video example of resistance. phttp://www.cartoonstock.com/newscartoons/cartoonists/ksm/lowres/ksmn1044l.jpg]

  9. Ohm’s Law • As the resistance in the circuit increases, the current (number of charges) decreases. • V = I R Click Here for an Interactive Example

  10. Ohm’s Law • Example: • A circuit has a resistance of 0.5 Ω and has a current of 3.0 A. What size battery in volts is needed? • V = (3.0 A) x (0.5 Ω) • V = 1.5 V

  11. Ohm’s Law • Example: • A 9-volt battery is used in a circuit with a resistance of 1.5 Ω. What current is needed? • (9 V) = I (1.5 Ω) I = 6.0 A (1.5 Ω) (1.5 Ω)

  12. Circuit Diagrams • A 2-dimensional representation of an electrical circuit. [http://www.ise5-14.org.uk/Prim3/New_Guidelines/Newsletters/9/IMGS/bulb.gif]

  13. Some diagram symbols include… Open Switch or Light Bulb Voltmeter Ammeter

  14. Series Circuits • The current only has one possible circuit to pass through. [http://iss.cet.edu/electricity/pages/images/B/b13_2.jpg]

  15. [http://www.danieltrimpey.com/learn/electronics/images/series.GIF][http://www.danieltrimpey.com/learn/electronics/images/series.GIF] 3 2 1

  16. Parallel Circuits • There are two or more branches on each circuit for current to move through. [http://iss.cet.edu/electricity/pages/images/B/b13_3.jpg]

  17. [http://www.danieltrimpey.com/learn/electronics/images/series.GIF][http://www.danieltrimpey.com/learn/electronics/images/series.GIF] 1 2 3

  18. Circuit Protection Devices • If too much current flows through a circuit, a safety device shuts off the current in order to prevent it from overheating.

  19. Circuit Protection Devices • Fuses • A small piece of metal that will melt if too much current passes through it. [http://hollyfuse.en.alibaba.com/product/50020315/50104654/5_phi__Fuses/50T_Fuses/showimg.html]

  20. May only be used once, then must be replaced.

  21. Circuit Protection Devices • Circuit Breaker • A piece of metal bends if too much current passes through, and it turns off the switch to the circuit. • Just need to reset the switch to use again [http://www3.sympatico.ca/mmatkiwsky/reng/images/Trailer/breakers.JPG]

More Related