lecture12 - Capacitance (II) Capacitance apacitors in...

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Capacitance (II) Capacitance (II) Capacitors in circuits Electrostatic potential energy
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Example Example Conducting spheres and a long wire: cm r 10 1 = cm r 30 2 = A total charge +12 C is placed on one sphere. The charge will move to the μ other sphere until A) the electric fields on the spheres are equal B) the electric potentials on the spheres are equal C) the electric charges on the spheres are equal
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Capacitors in Circuits Capacitors in Circuits Symbols: or Capacitor Battery Switch + + - -
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Capacitor Combinations Capacitor Combinations A B Series A B Parallel What is the “effective capacitance ” between A & B? A B +Q -Q charge held voltage difference eff C =
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Parallel Parallel C 1 C 2 C 3 A B V Voltages are the same : V 1 = V 2 = V 3 = … = V Charges add : Q Q Q Q = + + + ... 3 2 1 But… ... , , 2 2 1 1 V C Q V C Q = = ... 2 1 + + = C C C eff 1 2 ...... eff Q Q C V + + =
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Series Series Voltages add : V V V = + + ... 2
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This note was uploaded on 01/13/2011 for the course PHYSICS Physics 1E taught by Professor Venus during the Winter '03 term at McMaster University.

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lecture12 - Capacitance (II) Capacitance apacitors in...

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