Capacitance is defined as
- 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.