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Lab 04 Capacitors IVC 2009

# Lab 04 Capacitors IVC 2009 - Lab 04 Capacitors Laboratory...

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Lab 04 Capacitors Laboratory Objectives: To investigate various aspects of capacitors. 1) Determine the capacitance of several unknown capacitors. 2) Verify series and parallel combination 3) Find the time constant for an RC circuit. pg 1 Capacitors Equipment: 15 V Power supply ; timer stop watch; 1 switch; 3 capacitors ( 22μF plus two different ones ); leads to make parallel and series circuits; multimeter to read voltage and current.

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Capacitors pg 2 Introduction: A capacitor consists of two conductors that are given equal and opposite charges. Capacitors are often parallel plate conductors; concentric cylinders; and concentric spheres. Capacitor Symbol Capacitors: From left: multilayer ceramic, ceramic disc, multilayer polyester film, tubular ceramic, polystyrene, metalized polyester film, aluminum electrolytic. Major scale divisions are in centimeters.
Capacitors pg 3 A capacitor stores charges and electric potential energy. The capacitance is defined to be the ratio of the charge on each plate to the potential difference between plates: Q = CV Where Q is the charge in Coulombs, V is the potential difference in volts, and C is the capacitance in Farads F.

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Capacitors pg 4 Capacitors in parallel share a common potential difference but each may have different charges. V 16 Volts V 16 Volts Suppose that two capacitors are connected in parallel to a source emf as shown below: S C 1 C 2 V Theory
Capacitors pg 5 S C 1 C 2 V When the switch is closed charge flows from the battery into the capacitors until the potential difference across each is equal to V . If the total charge “pumped out” by the battery is Q. Hence: Q = q 1 + q 2 Where q 1 is the charge on capacitor 1 and q 2 is the charge on capacitor 2 . Furthermore from the definition of capacitance C = Q/V , this means: Q = q 1 + q 2 = C 1 V + C 2 V = (C 1 + C 2 )V From this result we see capacitors in parallel add to make an equivalent capacitance: C eq = C 1 + C 2 + … + C n + + - -

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Capacitors pg 6 S Emf + + - - For capacitors in series with a battery as shown,
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Lab 04 Capacitors IVC 2009 - Lab 04 Capacitors Laboratory...

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