1. Day 101, Tuesday, 16 February, 2016 Electrical Energy Juice (Electricity) Volts / Amps / Current / Power / Ohm’s law / Δ V Batteries

2. Juice Electricity, like water it is!* * Yoda

3. Electricity is a fluid “Electricity is energy looking for a place to go.”* *Electrician’s operating definition of electricity

4. Fluid Characteristics Water vs Electricity Volumecoulombs Flowamps (coulombs/second) Pressurevolts Source source (generator, battery etc) Bucketcapacitor

5. The charges gain potential energy, then the potential energy is converted to equal amounts of kinetic energy.

6. Voltage vs Amperage Voltage does not kill you, amperage does High voltage will, however, will let the amperage penetrate your skin So…

7. Voltage and Amperage Volts and Amps Volts Under 40can’t penetrate skin 40 to 80? Over 80can penetrate skin Amps 1 mAfeel mild shock 5 mApainful 15 mAno muscle control 100 mAdeath 

8. Electric Current Flow of positive charge is conventional current Current generated by cell, battery, photovoltaic cell, generator usually consists of electrons

9. Direction of current Current defined as flow of positive charges In the real world negative charges flow Real world current flows in opposite direction from theoretical current

10. Power P = IVWatts I is current (amps) V is voltage (volts) (C/s) (J/C) = J/s = Watts

11. Ohm’s Law R = V/I V = IR I = V/R Ohm’s law assumes constant resistance independent of potential difference (voltage) Non linear devices (electronics) do not follow Ohm’s law

12. Where sparrows tread eagles die Sparrows and Eagles

15. Electrolytic Cell

16. Baghdad Battery

17. Battery A battery is a collection of cells working together

19. Car Battery with Cells

20. Credits 9 Volt battery Electronics.howstuffworks.com Voltaic Cell Britannicastudent.com Baghdad Battery www.smith.edu Car Battery diagramhttp://www.driveelectric.org/cars/ima ges/battery_cell_view.jpg

21. Credits II Simple Circuit animation: www.regentsprep.org

22. Extra Credit Yoda photo www.sodahead.com Birds on an electrical line www.ehowcdn.com Eagle on an electrical pole http://www.wichitawaterproject.org/electri cal-substation.html