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# 1 electric energy & potential AP

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### 1 electric energy & potential AP

1. 1. Gravitational Electric EElectric vs. Gravitational g Potential Potential Energy Energy Increases Increases - + • Work is needed to • Work is needed to push an object push a charge against against gravity and a field and give it give it Potential Electric Potential Energy Energy
2. 2. Potential DifferencePotential Energy & Potential Difference  Voltage (scalar or vector) Divide both sides by qo What does voltage and you get another actually measure? physical quantity: – Measures how much Electric Potential! energy a charge will Otherwise known as gain/lose voltage! – Measures how much work that can be done by a charge If the Electric Field is constant, it comes out of the integral and you get V = Ed
3. 3. Allesandro VoltaUniform Electric Fields (Italian: 1745 – 1827) Parallel Plates Point charge Note the field lines Uniform electric field
4. 4. Battery gives the electron 12 J of Potential energy e “loses” energy as it travels through the circuit.Analogy 12 V 0V Battery “gives” energy back to electron to repeat cycle
5. 5. • Sample ProblemPotential Energy & Potential Difference A 9 V battery is connected to two parallel plates that are separated by a distance of 0.30 cm. a. What is the electric field? b. How much energy would an electron have when placed next to the positive plate? + + + D = 0.04m – – p+ – a) V = E d b) Ue = q ∆V 9 = (E)(0.003m) = (9 V)(1.6 x 10-19C) Ue = 1.44 x 10-18 J E = 3000 V/m
6. 6. Key Ideas
7. 7. times chargecompliments of Mike Gearon Flow Chart times per unit = Potential distance = Work distance Gradient per unit charge
8. 8. times chargecompliments of Mike Gearon Flow Chart times per unit = Potential distance = Work distance Gradient per unit charge
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