Electric Bulb
YT Kartickにより
1. Future Potential
1.1. Energy Efficiency
1.1.1. Smart Bulb
2. Who?
2.1. Thomas Edison
3. How?
3.1. Electricity heats
3.1.1. produces light
4. Process
4.1. Filament making
4.1.1. Assembling
4.1.1.1. Testing
5. Impact
5.1. Brighter homes
5.1.1. Use for work
6. Evolution
6.1. Incandescent
6.1.1. CFL Bulb
6.1.1.1. LED Bulb