Burner Ignition Spark Energy Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 26, 2026Burner Ignition Spark Energy Calculator
Most hydrocarbon-air mixtures technically ignite with a tiny 0.2-0.3 mJ spark under ideal lab conditions - but real ignition transformers deliver far more energy than that bare minimum, deliberately, to handle real-world conditions.
Formula: E = 0.5 × C × V²
Example: a 100 nF capacitor discharged at 15 kV: E = 0.5 × 100e-9 × 15,000² = 11.25 J = 11,250 mJ - tens of thousands of times more than the bare theoretical minimum.
Frequently Asked Questions
Why so much more energy than the theoretical minimum?
Real ignition needs margin for non-ideal mixture ratios, electrode heat losses, and reliable ignition across a range of conditions - a system designed right at the theoretical minimum would fail intermittently in practice.
Does higher spark energy mean better ignition?
Up to a point, yes, but excessive energy mainly wastes electrode life and adds cost without further reliability benefit once comfortably above the practical ignition threshold for the application.