On what principle does a solar fan work?

The first law of thermodynamics. In brief, energy can neither be created nor destroyed. However, energy may be converted from one form to another.

Explanation:

A basic electrical solar fan comes in two parts: a solar panel connected to an electrical motor. The solar panel converts solar energy to electricity; the electrical motor converts electricity to mechanical energy, which causes the blades to turn.

This energy conversion is possible because of the first law of thermodynamics. This law states that the total energy of the universe is constant. Energy can neither be created nor destroyed. However, energy may be converted from one form to another.

For example, the solar panel does not destroy the solar energy; it simply converts that energy to electrical energy. Note that a fraction of that energy absorbed was lost as thermal energy. Similarly, the motor merely converts electrical energy to mechanical energy. It might also lose some thermal energy as it heats up.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

1 is a answer of a question