Capacitance is defined as
Correct answer: A. the charge stored per unit potential difference across the capacitor
- A. the charge stored per unit potential difference across the capacitor
- B. the energy stored per unit charge
- C. the charge multiplied by the voltage
- D. the potential difference per unit charge
Explanation
C equals Q over V, measured in farads, and it depends only on the geometry of the plates and the dielectric between them, not on how much charge happens to be stored. A farad is a very large unit, so practical capacitors are rated in microfarads or picofarads. Doubling the voltage doubles the charge stored and leaves the capacitance unchanged.
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About Capacitors
Capacitors store electric charge and energy in an electric field between conductors. Work includes capacitance, the relation Q = CV, dielectric materials, charging and discharging, energy formulas, and combinations of capacitors in series and parallel. Electric potential difference is needed to understand why charge and stored energy change.
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