Hydraulic lift works on the principle of the Pascal’s law. Acc to this law, in the absence of gravity, the pressure is same at all points inside the liquid lying at the same horizontal plane
Working of Hydraulic effect:→
a = Area of cross –section of piston at C
A = Area of cross – section of piston at D.
Let a downward force f be applied on the piston C. Then the pressure exerted on the liquid, P = f/a
Acc to Pascal’s law, this pressure is transmitted equally to piston of cylinder D.
Upward fore acting on the piston of cylinder D will be :→
F = PA
= (f/a)A
As A ≫ a, F ≫f
i.e. small fore applied on the smaller piston will be appearing as a very large force on the large piston. As a result of which heavy load placed on larger piston is easily lifted upwards.
