Sci 9 Lesson 3 May 5 - Electric Potential Energy and Voltage
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  • 1. Homework from last class:
    • Complete the 7-2C lab activity worksheet (if not already completed in class)
    • Complete the “Neutral, Positive, or Negative Charges?” and “Positive, Negative, and Neutral Objects” worksheets
    • Study for Ch. 7 quiz next class
    • Read over class notes and check class blog
    • http://www.msoonscience.blogspot.com
  • 2. Chapter 7 Quiz
    • You will have ~15 minutes to write the quiz.
    • Please fill in the Scantron form with your name, date, block, and quiz VERSION number .
    • Do NOT write on the quiz – only the answers on the Scantron form will be marked.
    • Good luck!
  • 3. Chapter 8 pp. 270-275 Ch. 8.1 Electric Potential Energy and Voltage
  • 4. What do the following have in common?
  • 5. They all require batteries to operate! Good detective work!
  • 6. Demo Time!
  • 7. What is a battery?
    • Energy: the ability to do work – to make things move or change
    • A battery is a device that stores the energy in electric charges so that it can be used at some point to do work .
    • A battery is a source of electric potential energy
    • Electric potential energy: stored energy that has the potential to make something move or change
    pp. 270 - 271
  • 8.
    • A battery converts chemical energy  electrical energy
    • Ex: Batteries that power a flashlight
    • Batteries are also called electrochemical cells
    • May be dry cells or wet cells
    What does a battery do? pp. 270 - 271 Moist paste Fluid
  • 9. pp. 270 - 271
    • Terminals (aka electrodes): the end points of a battery where we make a connection
    • Electrodes are in a moist paste called an electrolyte  conducts electricity
    • Electrons build up on one side (negative)
    • Electrons withdraw from the other side (positive)
    Once +ve and –ve charges are separated , they have the ability to do work Ex: Making a bulb light up
  • 10. Electric Potential Difference
    • Potential difference (aka voltage): the difference in potential energy (stored energy) per coulomb of charge between two points of an electric circuit.
    • Unit for voltage is the volt (V)
    • Measure voltage with a voltmeter
    • Voltage causes charges to move – charges (extra electrons) will move from a higher level of energy to a lower level of energy
    pp. 272 - 273
    • Voltage is produced when electrodes in an electrolyte chemically react to produce electrons and different charges on each electrode .
    • Creates a potential difference .
  • 11. Homework for next class:
    • Complete the Reading Check questions on p. 275 (#s 1-9)
    • Complete the “Reading an Analogue Meter” worksheet
    • Bring a fruit for the next class! We’re doing a fruit lab!
      • 5 bonus marks if you bring your own fruit!
      • Examples: grapefruit, orange, lime, lemon (relatively large)
    • Read over class notes and check class blog
    • http://www.msoonscience.blogspot.com
    • Have a great weekend!
  • 12. Works Cited
    • Images taken from the following sources:
    • http://cobygz.en.made-in-china.com/product/DqvENnjVhQiP/China-Portable-MP3-CD-Player-with-Am-FM-Stereo-Tuner-MP-CD451-.html
    • http://www.binbin.net/compare/Control-A-Kid-Remote.htm
    • http://www.mrgadget.com.au/blogarchive/2004_12_01_mrgadgetblog_archive.html
    • http://5-h.wikispaces.com/Science+Spot
    • http://www.itechnews.net/2007/09/09/casio-exilim-ex-z8-digital-camera/
    • http://www.geeky-gadgets.com/spy-gadgets-the-video-camera-watch/
    • http://www.teach-nology.com/worksheets/early_childhood/color/detective/
    • http://icydk.com/2007/09/22/ozzy-osbourne-the-new-energizer-bunny/
    • http://mtbethel.blogs.com/greenwald/20082009/page/7/
    • http://www.123rf.com/photo_7187238_yellow-small-battery-with-positive-and-negative-signs.html
    • http://classroomclipart.com/cgi-bin/kids/imageFolio.cgi?action=view&link=Clipart/Animated_Clipart&image=lightbulb.gif&img=&tt
    • http://www.saltysmarine.com/index.php?main_page=index&cPath=84_120_116
    • http://www.foodsubs.com/Fruitcit.html