Capacitance
### Electromagnetism & Capacitance Theory **Capacitance ($C$)** measures a component's ability to store electrical charge per unit voltage potential. ### Primary Electromagnetic Formulas -.
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📐 Formula
💡 Practical Example
A 50 cm² dual-plate capacitor insulated with a 0.5 mm Mylar film produces 283.33 pF, storing 0.354 microJoules when charged to 50 Volts.
📖 About Capacitance
Electromagnetism & Capacitance Theory
Capacitance (C) measures a component's ability to store electrical charge per unit voltage potential.
Primary Electromagnetic Formulas
- Parallel Plate Capacitance:
C = (_r × _0 × A) / (d)
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- Stored Electric Charge: Q = C × V [Coulombs]
- Stored Electrostatic Energy:
E = (1) / (2) C V^2 = (Q^2) / (2C) [Joules]
Dielectric Constants (Relative Permittivity _r)
- Vacuum / Air: 1.0006
- Mylar Film: 3.2
- Paper / Bakelite: 3.5
- Mica: 6.0
- Tantalum Oxide: 25.0
- Barium Titanate Ceramic: 1,200.0
How to Use This Calculator
Enter your Capacitor Plate Area (A in cm²) (e.g. 50.0 in cm²), Dielectric Separation Distance (d in mm) (e.g. 0.50 in mm), Dielectric Material (Relative Permittivity εr) — choose from Air / Vacuum (εr = 1.0006), Paper / Bakelite (εr = 3.5), Mylar / Polyester Film (εr = 3.2), and Applied Voltage (V in Volts) (e.g. 50.0 in V). Results update instantly as you type — adjust any value to compare scenarios.
The Formula
C = (er e0 A) / d
Q = C * V (Coulombs)
E = 0.5 C V^2 (Joules)
Worked Example
A 50 cm² dual-plate capacitor insulated with a 0.5 mm Mylar film produces 283.33 pF, storing 0.354 microJoules when charged to 50 Volts.
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