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Unformatted text preview: rs Ch. 23 Electric Potential and Electric Potential Energy
● The amount of electric potential energy a point charge would have at a given point
● Relative value, and therefore doesn’t carry any physical meaning until you compare it to
another reference point (commonly infinity, where V = 0)
● Movement of charges depends on the relative potentials!
○ Positive charges will move from ____________________ potential to
________________ potential at ___________________________ speeds.
○ Negative charges will move from ____________________ potential to
________________ potential at ___________________________ speeds.
● Relevant equations or forms of V:
○ For continuous charge distributions:
○ For use with potential energy:
○ For when you already know the electric field:
○ For when you know potential and want to find the E field:
● When dealing with Electric Potential Energy:
○ Think 151! Conservation of energy!
■ In these problems, likely that Potential Energy will be converted to Kinetic
Energy
○ Make sure you consider what types of charges you are working with in the
problem to understand whether or not potential energy increases or decreases in PHYS 152 Fall 2013
Supplemental Instruction Matt Lui and Anjali Shah uscphysics152si@gmail.com a given situation
■ When you bring a positive test charge closer to a positive charge
distribution, potential energy ______________________.
■ When you bring a negative test charge closer to a positive charge
distribution, potential energy ______________________. Ch. 24 Capacitors
● Store electric energy by keeping two oppositely charged plates close to each other ● Space between plates can be air or some dielectric material ● Equation for capacitance
○
○ ● C=
can be used to calculate the capacitance from the voltage between t...
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 Fall '09
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