1. Energy Density

2. Leyden Jar  A Leyden jar has metal foil on both the inside and outside surface. The surfaces are connected each to a voltage source. The electrical energy is stored A) nowhere since there the charges are static.A) nowhere since there the charges are static. B) on the metal foil.B) on the metal foil. C) in the glass of the jar.C) in the glass of the jar. D) in the space inside the jar.D) in the space inside the jar.

3. Work Between  Moving a charge from one plate of a capacitor to another requires work. Move positives from negative plateMove positives from negative plate  As more charge moves the field increases So does work neededSo does work needed  The average work needed is equal to energy stored.   

4. Total Energy  The energy stored in a system of capacitors can be determined from the energy stored in each   C1C1 C2C2

5. Open Circuit  A charged capacitor will hold the charge unless there is a path for the charge to move freely.  If the wires are disconnected this is an open circuit. 

6. Closed Circuit  A wire connecting the plates forms a conducting path.  This is a closed circuit. Also called a short circuitAlso called a short circuit  A short circuit releases the energy stored in the capacitor. Sudden release can cause unwanted surges of chargeSudden release can cause unwanted surges of charge 