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H |
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Electric
Potential Energy
and
Electric Potential |
H |
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Electric
Potential Energy (Joules) Capacitors exist
everywhere. Nature has evolved nerve cells of which the axons are capacitors
of a sort!
By creating a capacitor (cell membrane) and an Electric Field between the
surfaces of the cell membrane we are able to store energy in the Electric
Field for later use. We transform the energy in the Electric field
to energy of motion.
Electric
Potential Energy (U = EPE)
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Work
required to move a charge in an Electric Field
For the axon (nerve cell) to propagate an electrical signal, it must
store energy. That stored energy is in the form of an Electric Field. The
cell membrane is a capacitor. The Electric Field is created from the concentration
of ions inside and outside the cell membrane. Now, all the cell has to do
is allow the concentrations to change. This requires work.
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Distance (meters)
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W
is Electric Potential Energy (Joules)
is not
V is Electric
Potential (Joules/Coulomb)
a.k.a Voltage, Potential Difference |
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Equipotential
Surfaces
No work is required
for a charge to move along an equipotential surface.
Work
is required for a charge to move to a different equipotential surface.
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Summary
of Equations
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Capacitors |
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Capacitors
I,
II,
III
The Electric Field
The Electric Force
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Problem
Solving
Conservation of Energy |
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The
Mechanical Universe |
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In chapter 18, I like these medium problems
14, 26, 34, 63, 69, 76, 81
and any basic problems
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