What makes electricity? Is it the heat from the friction or?? If voltage is the speed of electrons passing and you measure the speed, how do you measure current? Because doesn't the length of the conductor like decide how many electrons there are? Because the electrons enters AND leaves the conductor. Or how are you supposed to measure the amount of electrons?

we need to know the time interval during which the force acts. impulse of force = momentum change

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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