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Review for test on electric circuits

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  1. 1. Electricity Circuits and How They Work
  2. 2. What is Electricity? How Electricity Works
  3. 3. Flashlights <ul><li>Flashlights are a perfect example of how electricity travels in a path. The electricity flows through the batteries and up to the light bulb and then down through the metal bar on the side. The switch completes the circuit to turn the light on and breaks it to turn it off. </li></ul>
  4. 4. A Simple Circuit <ul><li>Electricity needs to travel in a path called a circuit . </li></ul> Go to the website below to see an animation.
  5. 5. Label the Parts <ul><li>Label the parts of the circuit below. </li></ul>load conductor switch power source
  6. 6. Open and Closed Circuits <ul><li>Since electricity must move in a path, if the path is broken, the electricity can’t move. Think of when the bridge in Stone Harbor is up. No one can move until it closes again. But when the bridge is down, the path is complete and traffic can start moving again. </li></ul>Drawbridge is open so traffic is stopped. Drawbridge is closed so traffic can move.
  7. 7. Open and Closed Circuits
  8. 8. Open Circuits <ul><li>In an open circuit, there is a break in the path, so the electricity cannot flow. </li></ul>open circuit – motor won’t move switch is open Click here for a great website to practice circuits
  9. 9. Closed Circuits <ul><li>In a closed circuit, the path is complete, so the electricity can flow. </li></ul>closed circuit –light bulb lights switch is closed
  10. 10. Open or Closed Circuit? <ul><li>Look at the pictures below and decide if they represent open or closed circuits. </li></ul>open open closed closed
  11. 11. Conductors and Insulators <ul><li>Conductors are substances that electricity flows through. Metals are good conductors, as well as water. Insulators are substances that electricity does not flow through. They are often wrapped around conductors to keep people safe. </li></ul>
  12. 12. Conductor or Insulator? <ul><li>Look at the substances below and decide if they are conductors or insulators . </li></ul>copper plastic water rubber wood glass aluminum silver insulator insulator conductor conductor conductor insulator insulator conductor
  13. 13. Series and Parallel Circuits <ul><li>Often, more than one item are connected to a power source. This can be done in two ways: series and parallel circuits. </li></ul><ul><li>In a series circuit, one switch controls all of the items in the circuit. </li></ul><ul><li>In a parallel circuit, more than one switch is needed so that the items can be turned on an off individually. </li></ul><ul><li>The big difference between a series and parallel circuit is the number of switches. A series has one, where a parallel has more than one. </li></ul>
  14. 14. Series Circuits <ul><li>In a series circuit, all of the items are connected to one circuit and controlled by one switch. All the items are turned on and off at the same time. </li></ul>
  15. 15. Parallel Circuits <ul><li>Parallel circuits are used when the items in the circuit need to be turned on and off individually. Look for more than one switch. </li></ul>
  16. 16. Series or Parallel? series parallel parallel series
  17. 17. Electricity Symbols In order to be able to draw complicated electrical systems, a set of symbols has been created that everyone can use and understand.
  18. 18. Circuit Diagrams This is a symbol circuit with a battery, switch, and light bulb. This is a circuit with two batteries, a switch and a motor.
  19. 19. Circuit Diagrams Above is a series and parallel circuit diagram. series parallel
  20. 20. Picture Credits <ul><li>The graphics in this slide show can be found at the websites below: </li></ul><ul><li>http://www. bbc shtml </li></ul><ul><li> </li></ul><ul><li>http://www. pge . com/microsite/pge_dgz/wires/concepts .html </li></ul><ul><li>http://members. shaw .ca/len92/worksheet.htm </li></ul><ul><li>http://www. explainthatstuff .com/electricity.html </li></ul><ul><li>http://www1.curriculum. edu . au/sciencepd/electricity/elec-circ . htm </li></ul>