lecture6 - Lecture 6 Capacitance In this lecture you will...

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1 ECE 303 – Fall 2005 – Farhan Rana – Cornell University Lecture 6 Capacitance In this lecture you will learn: • Capacitance • Capacitance of Some Simple Structures • Some Simple Solutions of Laplace’s Equation ECE 303 – Fall 2005 – Farhan Rana – Cornell University Capacitance Consider two metallic objects connected by a voltage source V + - + + + + + + + + + + + + + + - - - - - - - - - - - - - - • The total charge on both metal objects have the same magnitude but opposite sign • The charge is proportional to the applied voltage: V Q total charge + Q total charge - Q • The constant of proportionality is called the capacitance C : CV Q = • Capacitance has units Coulombs/Volts or Farads • More generally, capacitance is also defined as: dV dQ C =
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