Convert Electronvolts to Horsepower-Hours
Convert Electronvolts (eV) to Horsepower-Hours (hp·h) instantly and accurately.
Conversion Formula
hp·h = eV × 5.968206271e-26
About Electronvolts
An electronvolt (eV) is the kinetic energy gained by one electron accelerated through 1 volt - exactly 1.602176634 × 10⁻¹⁹ J (fixed by the 2019 SI revision). It is the natural energy unit of atomic and particle physics: visible light photons carry 1.7-3.1 eV; hydrogen ionisation requires 13.6 eV; X-ray photons span 100 eV-100 keV; protons at the LHC reach 6.5 TeV. Rest masses use eV/c²: electron 0.511 MeV, proton 938.3 MeV, Higgs boson 125 GeV. Nuclear binding energy peaks at ~8 MeV/nucleon for iron-56. 1 eV = 1.602176634 × 10⁻¹⁹ J.
About Horsepower-Hours
A horsepower-hour (hp·h) is the energy from one mechanical horsepower (745.6999 W) for one hour - exactly 2,684,519.54 J ≈ 2.685 MJ. James Watt coined the horsepower to compare his steam engines with mine horses; billing in hp·h preceded the kilowatt-hour tariff. The metric horsepower (PS = 75 kgf·m/s = 735.499 W) gives a slightly smaller metric-hp·h = 2,647,795 J, used in European and Japanese engine datasheets. Today the hp·h appears in marine engineering logs, mining energy accounting, and vintage industrial equipment. 1 hp·h = 2.6845 MJ = 0.74570 kWh = 641.19 kcal.
Quick Reference Table
| Electronvolts (eV) | Horsepower-Hours (hp·h) |
|---|---|
| 1 eV | 5.968 × 10-26 hp·h |
| 2 eV | 1.194 × 10-25 hp·h |
| 5 eV | 2.984 × 10-25 hp·h |
| 10 eV | 5.968 × 10-25 hp·h |
| 25 eV | 1.492 × 10-24 hp·h |
| 50 eV | 2.984 × 10-24 hp·h |
| 100 eV | 5.968 × 10-24 hp·h |