Energy Storage and Capacitors: Leyden Jar, Work, Total Energy, Open and Closed Circuits, Slides of Physics

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Energy Density

Leyden Jar

A Leyden jar has metal foil on both the inside andoutside surface. The surfaces are connected each to avoltage source. The electrical energy is stored

•^

A) nowhere since there the charges are static.

-^

B) on the metal foil.

-^

C) in the glass of the jar.

-^

D) in the space inside the jar.

Total Energy



The energy stored in a systemof capacitors can bedetermined from the energystored in each





^



C

(^1) C^2

V C

Q

1  1

V C

Q

2

2



V C V C Q

2

1





2 1 1 2

1

V C

E



2 2 1 2

2

V C

E



^

^

2

2

1

1 2

2 2 1 2 2 1 1 2

V C

C

E

V C

V C

E









Open Circuit



A charged capacitor will holdthe charge unless there is apath for the charge to movefreely. 

If the wires are disconnectedthis is an

open

circuit.

^

