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When a body of mass is elevated against the gravitational force the potential energy can be expressed as
Ep = Fg dh
= m g dh (1)
where
Fg = gravitational force acting on the body (N)
Ep = potential energy (J)
m = mass of body (kg)
g = gravitational acceleration (9.81 m/s2)
dh = change in elevation (m)
A body of 1000 kg is elevated 10 m. The change in potential energy can be calculated as
Ep = 1000 (kg) 9.81 (m/s2) 10 (m)
= 98100 J = 98 kJ = 0.027 kWh
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