Convert Ergs to Watt-Hours
Convert Ergs (erg) to Watt-Hours (Wh) instantly and accurately.
Conversion Formula
Wh = erg × 2.777777778e-11
About Ergs
An erg is the CGS unit of energy - the work done by one dyne through one centimetre - exactly 10⁻⁷ J. Despite SI adoption, the erg persists in astrophysics: the Sun's luminosity is 3.828 × 10³³ erg/s; gamma-ray burst isotropic energies are quoted in units of 10⁵¹ erg ('one foe'). Surface tension of water is 72.8 dyn/cm; the work to create 1 cm² of new water-air interface is 72.8 erg. Earthquake seismic moment M₀ is in dyn·cm = erg; the 2004 Boxing Day earthquake had M₀ ≈ 10²³ J = 10³⁰ erg. 1 erg = 10⁻⁷ J = 624.15 eV.
About Watt-Hours
A watt-hour (Wh) is the energy delivered by 1 watt for one hour - exactly 3,600 J. It is the practical unit for small-scale electrical energy: a 10,000 mAh 5 V power bank stores 50 Wh; a laptop battery holds 50-90 Wh; a smartphone battery holds 10-15 Wh; an AA alkaline cell stores ~3 Wh. LED lamps labelled 9 W save 51 Wh/h over a 60 W incandescent. IATA dangerous-goods rules use Wh as the threshold for lithium batteries in aircraft: cells >20 Wh and batteries >100 Wh need special approval. 1 Wh = 3,600 J = 3.412 BTU.
Quick Reference Table
| Ergs (erg) | Watt-Hours (Wh) |
|---|---|
| 1 erg | 2.778 × 10-11 Wh |
| 2 erg | 5.556 × 10-11 Wh |
| 5 erg | 1.389 × 10-10 Wh |
| 10 erg | 2.778 × 10-10 Wh |
| 25 erg | 6.944 × 10-10 Wh |
| 50 erg | 1.389 × 10-9 Wh |
| 100 erg | 2.778 × 10-9 Wh |