1 / 14

Electric currents

Electric currents. (Motion of electric charges). Physics 100 Chapt 13. Alessandro Volta. Positive Ions. Atoms with one or more electrons removed. _. _. +. +. +. _. _. _. +. +. _. _. _. ”net” charge = + 2q e. Battery. C. Zn. Zn. - -. + +. Zn. Zn ++. Zn ++. Zn. - -.

adin
Download Presentation

Electric currents

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 currents (Motion of electric charges) Physics 100 Chapt 13

  2. Alessandro Volta

  3. Positive Ions Atoms with one or more electrons removed _ _ + + + _ _ _ + + _ _ _ ”net” charge = +2qe

  4. Battery C Zn Zn - - + + Zn Zn++ Zn++ Zn - - - - Zn Zn + + - - Zn++ - - Zn Zn Zn++ + + acid

  5. “Voltage” Cathode Anode - + - - + + - - + + - E - + + - Zn++ - F + + W = Fd “Voltage” F = 2qeE d W0 2qe V W = 2qeEd  W0 = 2qeE0d  =E0d

  6. Energy gained by the charge W = Fd =Q E0d = QV F=QE0 F=QE0 Q Q Anode - + Cathode - E0 - + + - - + + Zn++ - - + + - Zn++ - + + d

  7. Units again! W = Q V joules joules coulomb W Q  V = = Volt coulombs joule coulomb 1 V = 1

  8. Continuous charge flow = “electric current” Electrical “conductor” connected between anode & cathode Q Q Anode - + Cathode - - + + - - + + Zn++ - - + + - Zn++ - + +

  9. electric current Coulombs second Units: Q t I = =Amperes Q Q Anode - + Cathode - - + + - - + + Zn++ - - + + - Zn++ - + +

  10. The conductor can be a piece of wire Q t I = + + + Anode - + Cathode - - + + - - + + Zn++ - - + + - Zn++ - + +

  11. The energy can be used to run a gadget Energy time QV t P= = = I V + I + + I I Anode - + Cathode - - + + - - + + Zn++ - - + + - Zn++ - + +

  12. Electric light 60 Watts I=? T Power = P = I V P V 60 W 100V I = = J/s J/C 1/s 1/C = 0.6 = 0.6 C s V=100V = 0.6 = 0.6 A

  13. General circuit I Appliance - + I + - 12V Energy source (device that separates + & - charge)

  14. analogy Amt of water flow ~ current appliance Height ~ voltage Pump ~ battery pump pond

More Related