Class6HO

# Class6HO - Class 6 Capacitance and Capacitors Physics 106...

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Unformatted text preview: Class 6 Capacitance and Capacitors Physics 106 Fall 2011 Press CTRL-L to view as a slide show. Learning Outcomes From last time: I The field lines are related to the field as follows: I What is the electric potential? I How are the electric field and the electric potential related? I How can we find the electric field and the electric potential? I How are electric fields and electric potentials used in practical applications? I The electric potential is the potential energy divided by the charge I The electric potential is also called the voltage I Applying fields to a CRT Learning Outcomes Today we will discuss: I Capacitance I Capacitors I Capacitors in series and parallel circuits I Dielectrics Capacitance Capacitance I A capacitor consists of two conductors, one with a charge + Q and one with a charge- Q . I Often the conductors are parallel plates. I The voltage difference between the conductors is Δ V . I Out of tradition and laziness, we usually write the voltage difference as just V . Capacitance I C ≡ Q V I Units: Farad (F) I 1 F = 1 C / 1 V I A farad is very large I Often will see μ F or pF Capacitance I Q = CV I A big capacitor holds a large charge at a small voltage . Capacitors Capacitors I First developed by Pieter van Musschenbroek in Leyden in 1746 Parallel-Plate Capacitor I The capacitance of a device depends on the geometric arrangement of the conductors I For a parallel-plate capacitor whose plates are separated by air: C = A d Parallel-Plate Capacitor I The capacitor consists of two parallel plates I Each have area A I They are separated by a distance d I The + charge on one plate holds the- charge on the other plate in place. Parallel-Plate Capacitor I If the plates are large, the capacitor can hold more charge. I If the plates are closer together, the capacitor can hold more charge, because the + charge attracts the- charge more strongly. Parallel Plate Capacitor I Consists of two conducting plates, one positive and one negative I Charge is pulled to the inside surface of either plate I The field outside either plate is zero Parallel Plate Capacitor I Consists of two conducting plates, one positive and one negative I Charge is pulled to the inside surface of either plate I The field outside either plate is zero Electric Field in a Parallel-Plate Capacitor I The electric field between the plates is quite uniform Example 1: Derive the Parallel-Plate Capacitor...
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Class6HO - Class 6 Capacitance and Capacitors Physics 106...

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