Electricity

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31 oli ay, Cakes he ۴ 

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Applications of Electrostatics 

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Electric Charge * Oras in COOLODGG 0” 40 ASN al ‏دمص‎ ‎hers ‏یر‎ Om 

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Electric Potential Energy 

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Electric Potential Energy ا ل ا ل 9 .عجعج أادمه صا عصوام جوج ‎TDS a Ea De ACPA‏ 

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Diagram B B= 5 The + test charge will naturally move in the direction of the E field; ‘work isnot required. The potential energy of the charge will decrease. Diagram A B A ۵: ‏ف‎ ‘Moving the + test charge from location A to location B will require work and increase the potential energy of the charge. 

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Electric Potential Energy مر ا ا ا ا 5 

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Electric Potential (volts) "۹ ۱ 

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Electric Potential (volts) " Example: (OOO joules oP work is doar to ‏عملا جمدم‎ CAS fm ANS De ACT ‏جملا صا ررورره عونا‎ OAS acd Deas ac en (DROME De Nice eee eae ea eres asl ‏7سا رت اب‎ 

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Electric Potential (volts) 2 Okat iP the charge io the previous problew Dace PAO ON aici CDA OD) Ds woud Kappes to the BR? 

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Electric Potential (volts) 2 Okat iP the charge io the previous problew Dace PAO ON aici CDA OD) Ds woud Kappes to the BR? = 11. DOOLO BE MLE GOME! ol OO a PUN ING ca aca cacd 

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Electric Potential vs Potential Energy (ON ans a ee nerd Ohkick kas wore ۱ an iG 

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Is 5000 Volts Dangerous? 5000 volts?) za 

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Is 5000 Volts Dangerous? "DOPE! و( ۷ عمد ۱ و رل ۱۳ ‎eh‏ مر عاس 6000 

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Potential Difference (voltage) ل ا 4 2 17271015 

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Potential Difference (voltage) bd (Vem cac caine a Pale cael cio cn Dies ۰ ۷ ‏کت ی مد ان را‎ x x J 

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Potential Difference (voltage) bd (Vem cac caine a Pale cael cio cn Dies ۰ be ‏ماه‎ SS aad 6 ۳ x J x J 

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Potential Difference ” 4 ‏ل‎ ‎۳ ‏جوج‎ A Simple Electric Cirouit ae 

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Potential Difference (voltage) 2 (Si ‏مم لا اه‎ eee ceca LN 

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Potential Difference (voltage) Okv 0 cact ۱ te 

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Current (I) Om VRE ee acs 

Electricity April 23, 2007 Applications of Electrostatics Electric Charge  Measured in COULOMBS  Six million trillion electrons is about - 1 C.  Six million trillion protons is about + 1 C. Electric Potential Energy Electric Potential Energy  This spring has more SPE when it is compressed Electric Potential Energy  This spring has more SPE when it is compressed  Likewise, these charges will have more potential energy when they are pushed closer Electric Potential Energy  PE equals the amount of work done to move a charge from one place to another. Electric Potential Energy  Which will have the larger electric potential energy? Electric Potential Energy  A – because it requires work to move it away from the negative charge. Electric Potential (volts)  EP = work/charge Electric Potential (volts)  Example: 1000 joules of work is done to move the charge q from far away to the place indicated. If q = 10 C, what is the electric potential at the new location? Electric Potential (volts)  Example: 1000 joules of work is done to move the charge q from far away to the place indicated. If q = 10 C, what is the electric potential at the new location?   Voltage = work/charge V = 1000 J/10C = 100 Volts Electric Potential (volts)  What if the charge in the previous problem were now 100 C instead of 10? What would happen to the EP? Electric Potential (volts)  What if the charge in the previous problem were now 100 C instead of 10? What would happen to the EP?  IT WOULD BE THE SAME!!!  Work would also increase Electric Potential (volts)  Electric potential is associated with LOCATION, not CHARGE Electric Potential vs Potential Energy  Which charge has more electric potential?  Which has more potential energy? Is 5000 Volts Dangerous? Is 5000 Volts Dangerous?  NOPE!  When 1 million electrons are added to a neutral balloon, it has an electric potential of 5000 volts Potential Difference (voltage)  Difference in electric potential between two points. Potential Difference (voltage)  Difference in electric potential between two points.  Potential difference between A and B is 0 A B Potential Difference (voltage)  Difference in electric potential between two points.  Now there is a potential difference A B Potential Difference  Batteries provide potential difference between one end of the circuit and the other Potential Difference  Batteries provide potential difference between one end of the circuit and the other  Charges flow from high to low electric potential Potential Difference (voltage)  Why aren’t birds on power lines shocked? Potential Difference (voltage)  Why aren’t birds on power lines shocked?  The Potential Difference between their feet is zero! (0 voltage) Current (I)  Net flow of electrons