Capacitors notes
OpenThe 4 formulas you need for Capacitors, on one page.
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Physics · printable
Capacitors: One-Page Formula Sheet
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Last updated: 26 October 2026
Formula sheet
Capacitors formulas
Capacitors — formula sheet
Formulas
- C = Kε₀A/d
- Energy U = ½CV² = Q²/2C
- Series: 1/C = Σ1/Cᵢ; parallel: C = ΣCᵢ
- Partial slab: C = ε₀A / (d − t + t/K)
Key ideas
- C = Q/V depends only on geometry and medium
- A dielectric increases C by the factor K
- In series the charge is the same; in parallel the voltage is the same
- Charge is conserved when capacitors are reconnected; energy is not
Traps to avoid
- Assuming V stays constant after the battery is removed
- Forgetting energy lost as heat in charge sharing
- Wrong combination formula (it is opposite to resistors)
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FAQs
Frequently asked questions
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Read it once a day for a week, then cover it and write the formulas from memory. Revise only the ones you missed.