Engineering & Physics CalcyZone Calculator
Capacitor Energy Calculator
Calculate energy and charge stored in a capacitor.
Stored energy
0.3125 J
Charge Q
25000 μC
Step-by-step working
- E = ½ C V² = 0.5 × 0.001 F × 25² = 0.3125 J
- Q = C V = 0.025 C
Mathematical Formula
E = ½ C V²; Q = C V.
Overview & Explanation
A charged capacitor stores energy in its electric field.
How It Works
- Convert μF to F.
- E = ½CV².
Practical Applications
- Power-supply hold-up.
- Camera flash.
Example 1: 1,000 μF at 25 V
0.3125 J.
1
Inputs
Capacitance (μF): 1000 · Voltage (V): 25
= entered
2
Step 1
E = ½ C V² = 0.5 × 0.001 F × 25² = 0.3125 J
3
Step 2
Q = C V = 0.025 C
4
Stored energy
Result
= 0.3125 J
Example 2: 2.7 F supercap at 2.7 V
≈ 9.8 J.
1
Inputs
Capacitance (μF): 2700000 · Voltage (V): 2.7
= entered
2
Step 1
E = ½ C V² = 0.5 × 2.7 F × 2.7² = 9.8415 J
3
Step 2
Q = C V = 7.29 C
4
Stored energy
Result
= 9.8415 J
How it's calculated & sources
E = ½ C V²; Q = C V.
Frequently Asked Questions
Why V²?
Energy rises with the square of voltage.
Safety?
Large capacitors can hold dangerous charge; discharge safely.
Usable energy?
Depends on the minimum voltage your circuit accepts.
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