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Question

Why does increasing voltage decrease capacitance?


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Solution

Capacitance:

  1. A capacitor is used to store electric charge.
  2. The more voltage (electrical pressure) you apply to the capacitor, the more charge is forced into the capacitor.
  3. In normal conditions if voltage increases/decreases then capacitance remains constant; it varies when the dielectric is inserted.
  4. Also, the more capacitance the capacitor possesses, the more charge will be forced in by a given voltage.
  5. This relation is described by the formula Q=CV or C=QV where Q is the charge stored, C is the capacitance, and V is the voltage applied.
  6. Here, from the equation, it is clear that capacitance is inversely proportional to voltage.
  7. So, when voltage increases capacitance decreases, and when the voltage decreases, capacitance increases.

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