phy16-1 - Chapter 16 Electric Energy & and Capacitance...

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Chapter 16 16.1 Potential difference and electric potential He is full of potential at this moment Potential to do a lot of damage Potential energy • Has to do with gravity (a force) • Has to do with height, or distance in the direction of the force Recall Work from PHY101 • Potential energy is always related to a force • In the presence of a force (gravity or electrical force), potential energy increases when an object is moved in the opposite direction of the forc the opposite direction of the force + + + + + + + + + + + + + A + + + + + + + + + + + + + A - A ----------------- + B ------------------ - B B EPE A EPE B EPE A EPE B
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An object by itself moves from a higher potential energy position to a lower energy position. Use this to determine which point has the higher potential energy. •Someone has to do some work to move an object to a higher potential energy position higher potential energy position. A Quantitatively speaking + + + + + + + + + + + + + A + + + + + + + + + + + + + A - B PE = PE final -PE initial = E B -E A = -(F x) ----------------- + B EPE = EPE B -EPE A = -( F x) = -(Eq x) ------------------ - B EPE = EPE B -EPE A = -( F x) = -(-Eq x) = -(mgh) F parallel to x F parallel to x F antiparallel to x
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Work and Potential Energy • There is a uniform field between the two plates • As the charge moves from A to B As the charge moves from A to B, work is done on it • W = Fd=q Ex (xf – xi)
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This note was uploaded on 03/15/2010 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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phy16-1 - Chapter 16 Electric Energy & and Capacitance...

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