# 1 - C = Q/V (Coulombs/Volts) = (F) I = (Coulombs/second) =...

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Unformatted text preview: C = Q/V (Coulombs/Volts) = (F) I = (Coulombs/second) = Amperes (A) Some useful equations V= IR Current Ohms law Capacitance V = Q/C Voltage across capacitor Changing the voltage in a capacitor V = Q/C Ic = Q/ t V = Ic t/C We change the charge by passing current The change in V depends on the duration of Ic Friday, September 10, 2010 electrostatic permittivity + + + A= Area d = distance (separation of the plates) C = Q/V C = Capacitor + + + + + Q Q A/d A C d C Capacitance = = Coulomb/Volt or Farads (F) _ _ _ _ Friday, September 10, 2010 Capacitor Release of pressure rubber membrane Water pressure Capacitors in parallel add larger Capacitance Small Capacitance Friday, September 10, 2010 Internal conducting solution (ions) External conducting solution (ions) Ion channels as resistors (conductors) Ion channels Voltage-gated, NT-gated etc. Friday, September 10, 2010 l = length A = Area R = V/I R = l/A resistivity l R A R = = Ohms law Ohms ( ) For the same current, a larger R produces larger V Friday, September 10, 2010 Resistors R 1 R 1 = 1/g 1 R 1 R 1 R 2 R 2 1/R T = 1/R 1 +1/R 2 g T = g 1 +g 2 R T = R 1 + R 2 For ion channels is better to think in terms of conductance As the # of Rs in parallel increases RT decreases!...
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## This note was uploaded on 09/21/2010 for the course NACS 641 taught by Professor Areneda during the Fall '10 term at University of Maryland Baltimore.

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1 - C = Q/V (Coulombs/Volts) = (F) I = (Coulombs/second) =...

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