zhang16-1

# zhang16-1 - Electric Energy and Capacitance The...

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1/19/2010 1 Electric Energy and Capacitance The electrostatic force: a conservative force just like gravitational force Can define a potential energy associated with this force Work done by a conservative force: negative of the change in potential energy A charge always gains kinetic energy and loses potential energy if released from rest in an electric field i f PE PE PE E W KE 0 : on conservati Energy PE KE PE W E

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1/19/2010 2 Two large parallel plates with opposite charges produce a uniform electrical field (except near edges) +q + - - - - - - qE F : force Electrical E F +q - - - - - - qE F : force Electrical E y qE W KE E ) ( increases energy Kinetic 0 : conserved is Energy PE KE y qE y F W E force electrical by the done Work y qE W PE E E ) ( : decreases energy potential Electric y
1/19/2010 3 The Electric Potential Difference A B • How much is the potential energy? mgh • Depends on how heavy (W=mg) he is • The height of the building h Mass in a gravitational field: Gravitational potential energy Charge particle in an electric field: Electrical potential energy The potential difference: Calculate potential energy from potential q PE V V V E A B ) ( field E the along nt displaceme : . ) ( y y qE PE E V q PE E ) ( (V) Volt or J/C : Unit SI The electric potential difference Potential difference is

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zhang16-1 - Electric Energy and Capacitance The...

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