Innovators
- Alessandro Volta
- Charles Kettering
- Farrington Daniels – solar energy
- Georges Leclanché – battery
- John Frederic Daniell – Daniell cell
- Rudolf Diesel – compression ignition internal combustion engine
- Georges Imbert – wood gas
- Leonardo da Vinci
- Moritz von Jacobi
- Nikolaus Otto – internal combustion engine
- Robert Stirling – Stirling engine (external combustion)
- Nikola Tesla
- James Watt – steam engine with separate condensor
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