Chapters16_19

# Chapters16_19 - Chapters1619...

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Alta Physics Chapters 16 - 19 Electrical Energy, Electric Fields  & DC Circuits

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Alta Physics Other Forms of Stored Energy: Chemical Energy Stored in the Chemical Bonds that  make up a substance Often released by combustion (burning) Released as  kinetic energy Heat Light Sound *** Demonstration ***
Alta Physics Electric Charge and Electric Field Static Electricity – Unmoving charge Two types  Positive – lack of electrons Negative – excess electrons Like charges - Repel Opposite Charges - Attract

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Alta Physics Electric Charges Charge can be induced by rubbing an  object – View demonstrations Charge is detected using an  electroscope. Charge can travel via a conductor. Poor conductors are insulators.
Alta Physics Force Exerted by Charges Coulomb’s Law F = kQ 1 Q 2 /r 2 k = 9 x 10 9  N•m 2 /C 2 Positive solution – repulsion Negative solution - attraction

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Alta Physics Sample Problem Two charges, Q 1  = +10 µC, and Q 2  = -15 µC,  are separated by 1.5 meters.  What is the  electrostatic force acting between them? Solution F = kQ 1 Q 2 /r  =   (9 x 10 9  N•m 2 /C 2 )(+10 x 10 -6  C)(-15 x 10 -6  C)/(1.5 m) 2  = -0.6 N
Alta Physics Electric Field Field – Affect that acts at a distance,  without contact Examples Electric Field Gravitational Field Electric Field Strength – E = F/q = kQ/r 2

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Alta Physics Sample Problem Calculate the strength of an electric  field at a point 30 cm from a point  charge Q = +3 µC Solution E = kQ/r  =   (9 x 10 9  N•m 2 /C 2 )(+3 x 10 -6  C)/(0.3 m) 2  = 300000 N/C
Alta Physics Electrical Energy Electrical Energy is generated from other  forms of energy and transmitted over power

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## This note was uploaded on 11/18/2011 for the course PHYS 121 taught by Professor Burgeson during the Fall '11 term at BYU.

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Chapters16_19 - Chapters1619...

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