Fizzix AP – Ch 16, 17, 18 Honors – Ch Electrostatics

Where are we AP? Heat & Thermo –Done… Ch EM –Current… Ch 16-22

Where are we HONORS? Heat & Thermo –Done… EM –Current… Ch –Magnetism… Ch 21 & 22 –Atomic/Nuclear… Ch 23 & 25

Intro Stuff Origin of electric charge –Atoms (duh … ) Nucleus –P + & N o »Even tho neither exists. Electron Shell –e-–e-

Schedoole Intro PPT –Practice Probs LAB –Discovery : V=IR Progress Reports/Grades Whining & Bribes

Intro Stuff e - – e=1.60x C – C? Coulomb –SI Unit for electric charge –Definition later – Ch19 –1C is charge on 6.25 x e -

Intro Stuff Law of Electrostatics –Likes repel, unlikes attract –Since there is an attraction or repulsion, there MUST be a force! Hmmm.  F=ma Coulomb ’ s Law …

Look Familiar?

Intro Stuff Example? Sure! –Calculate the ratio of the gravitational and the electrostatic forces experienced by en electron orbiting the nucleus of a basic H atom.

Intro Stuff

Electric Field –Area around a charge where another charge will feel a force

Q qoqo FeFe

F e <0 F e >0 Attracting Force Repelling Force

Stimulating Simulations Forces between charges Force Field around a single chargeForce Field around a single charge Yet another silly animation? And another? NO! NOT ANOTHER ONE!!! This is just SILLY!

FizzixFizzix AP – Ch 16, 17, 18 Honors – Ch Electric Potential

Intro Stuff Potential Energy ( ‘ member?) –Ball falls from A to B hAhA hbhb B A

Intro Stuff Electical Potential Energy –Charge ‘ falls ’ from A to B dAdA dbdb B A

Intro Stuff Electric Potential –‘ V ’ is the ratio EPE of a q o & the q o itself.

Intro Stuff Electric Potential DIFFERENCE –V B =V A

Intro Stuff Electric Potential DIFFERENCE

Intro Stuff Electric Potential DIFFERENCE

Intro Stuff Electric Potential DIFFERENCE –Example Work done by q o (2x10 -6 C) is 5x10 -5 J. Find  V.

Intro Stuff Electron Volt –Change in PE of an e - when moved through a PD of 1 Volt. 1eV=1.60x J

Intro Stuff Capacitors –C=q/V Unit is Farad (F) –C/V=F –Storage of charge –E= ½ CV 2 Used in MANY places …

Intro Stuff Capacitor Examples

Intro Stuff Capacitor Examples –Keys on keyboard

Intro Stuff Capacitor Examples –Electronic flash

Intro Stuff Capacitor Examples –Defibrillator

FizzixFizzix AP – Ch 16, 17, 18 Honors – Ch Electric Circuits

Intro Stuff Van de Graaff? –Charge Pump

Intro Stuff Van de Graaff? –Additional Demos Bubbles Rice Crispies –Volunteer???

Intro Stuff Van de Graaff # ’ s? –300,000V –<30  A –10,000,000,000  So just about everything is a ‘ conductor ’ to it!

Intro Stuff Circuit? –Power Supply –Resistance

Battery? A thing that produces a potential difference through a chemical reaction. –battery, electric, device that converts chemical energy into electrical energy. (How Stuff Works. Com) The act of beating or pounding. –Law. The unlawful and unwanted touching or striking of one person by another, with the intention of bringing about a harmful or offensive contact. (Wiki-Idiot-Pedia.comedy)

For example, here's what happens in one cell of a car's lead- acid battery: –The cell has one plate made of lead and another plate made of lead dioxide, with a strong sulfuric acid electrolyte in which the plates are immersed. –Lead combines with SO4 to create PbSO4 plus one electron. –Lead dioxide, hydrogen ions and SO4 ions, plus electrons from the lead plate, create PbSO4 and water on the lead dioxide plate. –As the battery discharges, both plates build up PbSO4 (lead sulfate), and water builds up in the acid. The characteristic voltage is about 2 volts per cell, so by combining six cells you get a 12-volt battery. A lead-acid battery has a nice feature -- the reaction is completely reversible. If you apply current to the battery at the right voltage, lead and lead dioxide form again on the plates so you can reuse the battery over and over. In a zinc- carbon battery, there is no easy way to reverse the reaction because there is no easy way to get hydrogen gas back into the electrolyte.

Intro Stuff Electromotive Force –emf Maximum terminal V of battery Current –Flow of charge

Intro Stuff

Ohm ’ s Law –States linear relationship between V & R

Intro Stuff Resistance –Says what it means e - has to ‘ fight ’ thru a wire or ‘ resistor ’

Intro Stuff Resistance –Radio Shack SCAM!

Intro Stuff Power –Same as regular P, but different

Intro Stuff Power …

Intro Stuff Wiring Circuits –Series / Parallel Series

Intro Stuff Wiring Circuits –Series / Parallel Parallel

Intro Stuff Wiring Circuits –Series / Parallel Parallel

Practice Stuff Boo-ring Book Shtuff –Ch16 pg437 #12

Practice Stuff Boo-ring Book Shtuff –Ch16 pg438 #22

Practice Stuff Boo-ring Book Shtuff –Ch17 pg456 #7

Practice Stuff Boo-ring Book Shtuff –Ch17 pg456 #14

Practice Stuff Boo-ring Book Shtuff –Ch17 pg457 #22

Practice Stuff Boo-ring Book Shtuff –Ch18 pg477 #7

Practice Stuff Boo-ring Book Shtuff –Ch18 pg477 #12

Practice Stuff Boo-ring Book Shtuff –Ch18 pg478 #26

Practice Stuff Boo-ring Book Shtuff –Ch19 pg499 #2

Intro Stuff Wiring Circuits –Now, DO IT! –LABS 40, 42, 43, & 44