A pumped-storage plant uses an electric motor of output to raise water for
PHYSICS · Multi-part · AP · Physics 1: Algebra-based · Work Energy and Power · Work Energy and Power
Problem
A pumped-storage plant uses an electric motor of output 100MW to raise water for 5h. The pumping (motor–pump) stage is 80% efficient, and the turbine–generator stage that later converts the stored energy back to electricity is 85% efficient.
(i) Gravitational potential energy stored
(ii) Electrical energy obtainable