A power specification formula is to be derived for electric motors which drive conveyor belts moving solid material at different rates to different heights and distances. Denoting the efficiency of a motor by ηand neglecting the power needed to drive the belt itself, derive a formula (a) in the SI system of units for the power p in kW, in terms of the mass flow rate m in kg/h, the height b and horizontal distance I in meters and (b) in U.S. customary units, for the power in hp, in terms of the material flow rate w in tons/h, and the height b and horizontal distance I in feet.

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