To date, solar radiation is not a practical source of electrical energy for

Question

BlackTom AI · Accepted Answer

The question asks to identify where solar radiation has not been a practical source of electrical energy to date.
Option 1: security lightings in parking lots. In fact, many parking lots use solar-powered lights successfully, especially in remote or off-grid locations, so this is a practical application.
Option 2: electric highway signs. Solar energy is commonly used to power highway signs in various regions, making this a practical use as well.
Option 3: cars. While there is ongoing research and some limited implementations of solar panels on vehicles, powering a typical car’s propulsion and systems solely with solar energy remains impractical due to insufficient energy density, intermittency, and the need for storage and weight considerations; thus this option reflects a domain where solar energy is not yet practically sufficient for widespread use.
Option 4: satellites in orbits around the earth. Solar power is standard on satellites, providing reliable energy in space, so this is a practical solar energy application.
In summary, among the listed options, cars are the scenario where solar radiation has not proven to be a practical primary energy source to date, whereas the other options have seen real-world, functional implementations.

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