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Chapter 18 Electric Energy and Capacitance demonstrations
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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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Figure 18-2 from p667 + d E Positive charge moves d through a uniform field +
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Potential Energy: Electric vs Gravity earth d PE gravity = mg h PE electric = -qE d m h
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Unit analysis PE= -qEd joules = coulombs newtons/coulomb meters E is sometimes in so and so
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Potential Difference Potential difference is the change in electric potential measured in volts V = V=-E d Units: volts=J/C Units: volts= *m
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Potential Difference in Charges and Fields sim 2.2 V/m -4.4 V
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Capacitors Device that stores charge Capacitance is a measure of the ability to store energy in the form of separated charges
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Capacitance Equations Q = total charge Units: farads = C/V 0 = permittivity constant (C 2 /Nm 2) A = area of plate d = Distance between plates
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Energy and Capacitors Equations
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