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# Sci 9 Lesson 3 May 5 - Electric Potential Energy and Voltage

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### Transcript of "Sci 9 Lesson 3 May 5 - Electric Potential Energy and Voltage"

1. 1. Homework from last class: <ul><li>Complete the 7-2C lab activity worksheet (if not already completed in class) </li></ul><ul><li>Complete the “Neutral, Positive, or Negative Charges?” and “Positive, Negative, and Neutral Objects” worksheets </li></ul><ul><li>Study for Ch. 7 quiz next class </li></ul><ul><li>Read over class notes and check class blog </li></ul><ul><li>http://www.msoonscience.blogspot.com </li></ul>
2. 2. Chapter 7 Quiz <ul><li>You will have ~15 minutes to write the quiz. </li></ul><ul><li>Please fill in the Scantron form with your name, date, block, and quiz VERSION number . </li></ul><ul><li>Do NOT write on the quiz – only the answers on the Scantron form will be marked. </li></ul><ul><li>Good luck! </li></ul>
3. 3. Chapter 8 pp. 270-275 Ch. 8.1 Electric Potential Energy and Voltage
4. 4. What do the following have in common?
5. 5. They all require batteries to operate! Good detective work!
6. 6. Demo Time!
7. 7. What is a battery? <ul><li>Energy: the ability to do work – to make things move or change </li></ul><ul><li>A battery is a device that stores the energy in electric charges so that it can be used at some point to do work . </li></ul><ul><li>A battery is a source of electric potential energy </li></ul><ul><li>Electric potential energy: stored energy that has the potential to make something move or change </li></ul>pp. 270 - 271
8. 8. <ul><li>A battery converts chemical energy  electrical energy </li></ul><ul><li>Ex: Batteries that power a flashlight </li></ul><ul><li>Batteries are also called electrochemical cells </li></ul><ul><li>May be dry cells or wet cells </li></ul>What does a battery do? pp. 270 - 271 Moist paste Fluid
9. 9. pp. 270 - 271 <ul><li>Terminals (aka electrodes): the end points of a battery where we make a connection </li></ul><ul><li>Electrodes are in a moist paste called an electrolyte  conducts electricity </li></ul><ul><li>Electrons build up on one side (negative) </li></ul><ul><li>Electrons withdraw from the other side (positive) </li></ul>Once +ve and –ve charges are separated , they have the ability to do work Ex: Making a bulb light up
10. 10. Electric Potential Difference <ul><li>Potential difference (aka voltage): the difference in potential energy (stored energy) per coulomb of charge between two points of an electric circuit. </li></ul><ul><li>Unit for voltage is the volt (V) </li></ul><ul><li>Measure voltage with a voltmeter </li></ul><ul><li>Voltage causes charges to move – charges (extra electrons) will move from a higher level of energy to a lower level of energy </li></ul>pp. 272 - 273 <ul><li>Voltage is produced when electrodes in an electrolyte chemically react to produce electrons and different charges on each electrode . </li></ul><ul><li>Creates a potential difference . </li></ul>
11. 11. Homework for next class: <ul><li>Complete the Reading Check questions on p. 275 (#s 1-9) </li></ul><ul><li>Complete the “Reading an Analogue Meter” worksheet </li></ul><ul><li>Bring a fruit for the next class! We’re doing a fruit lab! </li></ul><ul><ul><li>5 bonus marks if you bring your own fruit! </li></ul></ul><ul><ul><li>Examples: grapefruit, orange, lime, lemon (relatively large) </li></ul></ul><ul><li>Read over class notes and check class blog </li></ul><ul><li>http://www.msoonscience.blogspot.com </li></ul><ul><li>Have a great weekend! </li></ul>