1 / 19

G r ade

G r ade. 9. Science. Unit. 3:. Electri c ity. Chapter describes. 8 : Ohm’s law the relationship. of. current, voltage, and resistance. Electric P oten t ial Energy • Stored electrical energy

kellan
Download Presentation

G r ade

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. Grade 9 Science Unit 3: Electricity Chapter describes 8:Ohm’slaw therelationship of current,voltage,andresistance.

  2. ElectricPotentialEnergy •Stored electrical energy •Ex. A batteryhas storedelectrical energy becausethe electronshavetheability to do workaftertheyleave thebattery.

  3. Electrical Potential Difference •The changeinpotential energy per coulomb of charge. •Also calledvoltage •Measured involts(V) •Measured usingavoltmeter

  4. Electric Charge •Abuildingup at the negativeterminalof a cell/battery which then flows from thisterminalas negativecharges repelone another.

  5. Electric Current Flow

  6. Electric Circuit •Acomplete pathway that allows electronsto flow. •Will transform electrical energy intoother formsof energy.

  7. Sources of Electrical Energy: Source StaringEnergy Convertsto… Friction Rubbing ELECTRICAL ENERGY Piezoelectric crystals Pressure Photo- cells(solarcells) Solar/light electrochemical Thermocouples Heat Generators Mechanical Cells/Batteries Chemical

  8. Electric Current •The amount of charge passing a givenpoint ina conductor •Measured •Measuredammeter per second. inamperes (A) usingan

  9. Current Electricity •The continuousflow charge in a complete of circuit.

  10. Circuit Diagrams Seesymbols onpage 262.

  11. Electrical Resistance •Slows down theflow of electrons and transforms electrical energy. •Measured inohm’s (Ω) •The ratio of thevoltagetothe current.

  12. Factorsthataffectthe amount of resistance wire are: in a 1. 2. 3. 4. Length Diameter Type (thickness) Temperature

  13. Long,thin, tungstenwire Short,thick, copperwire

  14. Ohm’s Law •The mathematical relationship comparing voltage(V),current(I) and resistance (R)

  15. Ohm’s Law V I R

  16. Complete thepractice problemson pg.273-5 Law Ohm’s

  17. Resistors •Used tocontrol potential differencein acircuit. current or

  18. Core LabActivity Resistance and Ohm’s Law Pages 278-9

More Related