Using a convex lens to make electricity primarily involves harnessing solar energy, as a convex lens can focus sunlight onto a small area, creating high temperatures. Here are 50 creative ways to use convex lenses for generating electricity:

1. **Solar Concentrators**: Use convex lenses to focus sunlight onto photovoltaic cells to increase their efficiency.
2. **Solar Thermal Power**: Focus sunlight onto a heat absorber that drives a steam turbine to generate electricity.
3. **Solar Furnaces**: Use large arrays of convex lenses to focus sunlight onto a central point to produce steam and generate electricity.
4. **Solar-Powered Thermoelectric Generators**: Focus sunlight onto a thermoelectric generator to produce electricity directly from heat.
5. **Solar Water Heating**: Use focused sunlight to heat water, which then drives a steam turbine.
6. **Solar Cooking Power**: Use a convex lens in solar cookers to boil water, generating steam to power a small turbine.
7. **Stirling Engines**: Focus sunlight onto the hot end of a Stirling engine to generate electricity.
8. **Solar Desalination**: Use focused sunlight to evaporate seawater, with the steam driving a turbine before condensation.
9. **Solar-Powered Batteries**: Use convex lenses to heat thermophotovoltaic cells, converting thermal radiation into electricity.
10. **Solar Hot Air Balloon**: Heat air inside a balloon with focused sunlight; the rising hot air drives a turbine.
11. **Solar Thermoelectric Roof Tiles**: Integrate convex lenses into roof tiles to concentrate sunlight onto thermoelectric materials.
12. **Solar-Powered Steam Engines**: Focus sunlight to create steam pressure, driving a piston connected to a generator.
13. **Solar-Powered Sterling Engines**: Use focused sunlight to heat the working fluid of a Stirling engine to generate power.
14. **Solar Thermochemical Hydrogen**: Focus sunlight onto a reactor to split water into hydrogen and oxygen, using hydrogen in fuel cells.
15. **Solar Biomass Gasification**: Focus sunlight onto biomass to produce syngas, which is then used in a generator.
16. **Solar Pyrolysis**: Use focused sunlight to pyrolyze organic materials, generating syngas to power a generator.
17. **Solar Hydrogen Production**: Focus sunlight onto a photocatalyst to split water, using the hydrogen in fuel cells.
18. **Solar-Powered Thermoacoustic Engines**: Use focused sunlight to create sound waves that drive a generator.
19. **Solar-Powered Electrolysis**: Focus sunlight onto a high-temperature electrolysis cell to produce hydrogen and oxygen from water.
20. **Solar-Powered Fluid Expansion**: Heat a working fluid with focused sunlight, causing it to expand and drive a turbine.
21. **Solar-Powered ORC Systems**: Use convex lenses to heat a low-boiling-point fluid in an Organic Rankine Cycle system.
22. **Solar-Powered Chemical Heat Pipe**: Use focused sunlight to drive a chemical heat pipe, generating electricity from temperature gradients.
23. **Solar-Powered Biomass Dryer**: Focus sunlight to dry biomass, reducing its moisture content and making it more efficient for combustion.
24. **Solar-Powered Air Conditioning**: Use focused sunlight to drive a thermoelectric cooler, with the waste heat generating electricity.
25. **Solar Updraft Tower**: Focus sunlight to heat air at the base of a tower, driving turbines as the hot air rises.
26. **Solar Pond Power Plant**: Use focused sunlight to heat a salt-gradient solar pond, driving a thermoelectric generator.
27. **Solar-Powered Ammonia Synthesis**: Use focused sunlight to drive a reaction for ammonia production, with ammonia used in a fuel cell.
28. **Solar-Powered Stirling Refrigeration**: Use a convex lens to heat the hot end of a Stirling cooler, generating electricity from the cold end.
29. **Solar-Powered Fuel Cells**: Focus sunlight onto a solid oxide fuel cell to increase its operating temperature and efficiency.
30. **Solar Thermophotovoltaic Systems**: Use convex lenses to heat a thermal emitter, with the emitted light converted to electricity by PV cells.
31. **Solar-Powered Magnetohydrodynamic (MHD) Generators**: Focus sunlight to ionize a gas and create a plasma for MHD power generation.
32. **Solar-Powered Liquid Metal Battery**: Use focused sunlight to heat a liquid metal battery to optimal operating temperatures.
33. **Solar-Powered Hydrothermal Liquefaction**: Focus sunlight to convert biomass into liquid fuels, which can then be used to generate electricity.
34. **Solar-Powered Evaporative Cooling**: Use focused sunlight to power an evaporative cooling system, with the evaporation driving a turbine.
35. **Solar-Driven Hydrogen Compressors**: Use focused sunlight to heat hydrogen gas, making it easier to compress for fuel cells.
36. **Solar-Powered Biomass Gasifiers**: Use focused sunlight to gasify biomass, generating syngas for power generation.
37. **Solar-Powered Algae Bioreactors**: Focus sunlight to enhance algae growth, using algae as a biofuel for electricity generation.
38. **Solar-Powered Organic Rankine Cycle**: Use focused sunlight to heat an organic fluid in a closed-loop Rankine cycle system.
39. **Solar-Powered Chemical Looping**: Focus sunlight to drive a chemical looping process for hydrogen production.
40. **Solar-Powered Supercritical CO2 Cycle**: Use focused sunlight to heat CO2 above its critical point, driving a turbine.
41. **Solar Thermochemical Energy Storage**: Focus sunlight to drive endothermic reactions, storing energy for later electricity generation.
42. **Solar-Powered Phase Change Materials**: Use convex lenses to melt phase change materials, generating electricity as they solidify.
43. **Solar-Powered Vapour Absorption Systems**: Focus sunlight to drive a vapour absorption refrigeration cycle, with waste heat generating electricity.
44. **Solar-Powered Greenhouses**: Use focused sunlight to enhance greenhouse productivity, with biomass used for electricity.
45. **Solar-Powered Pyrolysis for Biochar**: Focus sunlight to produce biochar, using the off-gases to generate electricity.
46. **Solar-Powered Fluidized Bed Reactors**: Use focused sunlight to heat a fluidized bed reactor, producing syngas for power generation.
47. **Solar-Powered Hydrogen Fuel Cells**: Focus sunlight to increase the efficiency of solar hydrogen production for fuel cells.
48. **Solar-Enhanced Photosynthesis**: Use focused sunlight to boost plant growth, with biomass used for power generation.
49. **Solar-Powered Thermo-Electric Heat Pumps**: Use convex lenses to drive thermo-electric heat pumps, with the temperature difference generating electricity.
50. **Solar Thermal Electrolysis**: Focus sunlight to drive high-temperature electrolysis, producing hydrogen for power generation.

These ideas leverage the ability of convex lenses to concentrate sunlight, enabling various thermal and photovoltaic processes to generate electricity.