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Chapter 18 Electric Energy and Capacitance

Chapter 18 Electric Energy and Capacitance. demonstrations. Electric Potential Energy.  PE= -qE  d PE electric = -qEd charge electric field strength displacement from a reference point in the direction of the field Only for a uniform field Another type of Mechanical Energy. +. +.

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Chapter 18 Electric Energy and Capacitance

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  1. Chapter 18 Electric Energy and Capacitance demonstrations

  2. Electric Potential Energy • PE= -qEd • PEelectric= -qEd charge electric field strength displacement from a reference point in the direction of the field • Only for a uniform field • Another type of Mechanical Energy

  3. + + Positive charge moves d through a uniform field Figure 18-2 from p667 E d

  4. h Potential Energy: Electric vs Gravity  PEgravity = mg  h PEelectric = -qE  d m d earth

  5. Unit analysis PE= -qEd • joules = coulombs newtons/coulomb meters • E is sometimes in so and so

  6. Potential Difference • Potential difference is the change in electric potential measured in volts • V = • V=-E d Units: volts=J/C Units: volts= *m

  7. Potential Difference in Charges and Fields sim -4.4 V 2.2 V/m

  8. Capacitors • Device that stores charge • Capacitance is a measure of the ability to store energy in the form of separated charges

  9. Capacitance Equations Q = total charge Units: farads = C/V 0 = permittivity constant (C2/Nm2) A = area of plate d = Distance between plates

  10. Energy and CapacitorsEquations

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