21_Electrical_potential

21_Electrical_potential - Review from yesterday Please...

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1 Review from yesterday Please answer PROBLEM 3 in Knight on page 716 while we are waiting to start. “It takes 3.0 μJ to move a 15nC charge from A to B…”
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2 Review from yesterday Please answer PROBLEM 17 in Knight on page 717 while we are waiting to start. “What is the potential of an ordinary AA or AAA battery?. ..”
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3 Electric Potential Electric potential energy Electric potential Electric potential and electric field Capacitors Dielectrics Electric energy stored in capacitors
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4 Potential Energy • Energy stored in a system • Different types of potential energy • Gravitational • Elastic • Electrical
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5 Electric Potential Energy • Moving an electric charge in an electric field requires or releases energy, U (Joules). • (Note we use U for energy because the electric field is E) • The energy, U, is proportional to charge – just as the force is proportional to charge.
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6 Electric Potential • We define an Electric Potential, V, as the energy per unit charge, q: • V = U/q • Describes what would happen to a charge if it was placed in the electric field • This electrical potential is a property of the system of the surrounding charges • It has units of Joules/Coulomb, or Volts
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7 Electric Potential • Electric potential is a concept we use to be able to predict and calculate energies to move charges • The energy needed to move a charge from one potential V 1 to another, V 2 , is simply • ΔU = q(V 2 – V 1 ) • It is the same physical quantity on batteries
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21_Electrical_potential - Review from yesterday Please...

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