lec08_PyrakNolte

# lec08_PyrakNolte - Chapter 24 Capacitance Capacitor is a...

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2/1/12 1 2/1/12 1 Chapter 24 Capacitance Capacitor is a device that stores electrostatic potential energy. A capacitor consists of 2 spatially separated conductors which can be charged to +Q and - Q . 2/1/12 2 Capacitance The capacitance is defined as the ratio of the charge on one conductor of the capacitor to the potential difference between the conductors. Capacitance is measured in Faradays represented by the letter F which is equal to (coulomb/volt) 2/1/12 3 Capacitance between Parallel Plates Calculate the capacitance. We assume + , - charge densities on each plate with potential difference V : - - - - - + + + + A d 2/1/12 4 Example What is the capacitance of a parallel plate capacitor made out of two square plates 10 x10 cm 2 separated by 1 mm wide gap? d=1 mm A=0.01 m 2 If we connect 1.5V battery to its plates, how much charge could be stored in this capacitor?

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2/1/12 2 2/1/12 5 Calculating Capacitance 1. Put + Q , Q on the plates.
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