What is the formula linking energy stored (E), capacitance (C), and potential difference (V)?

 

E = 21CV2


E = energy stored (J)

C = capacitance (F)

V = potential difference (V)

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How is the energy stored in a capacitor represented as area under a graph?


The energy stored in a capacitor can be represented as the area under a graph of charge against voltage.

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What are some uses of capacitors as storage of energy?

  1. Flash photography

  1. Energy storage in electric vehicles
  2. Power supplies where they smooth the output of power

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Why are capacitors used in electronic flash photography?

Capacitors can provide a high current for a short period oftime, which is needed to create the flash of light.

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What happens to the energy stored by a capacitor as the potential difference across it increases?

The energy stored increases.

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