Acircuit is a path along which electric current flows. how would changing the battery in a circuit from 9 volts to 1.5 volts most likely affect the circuit?

this is poiselle's equation from fluid mechanic in physics. mech eng

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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