The electrical energy used to pump the water up to the mountain lake is 1.2 x 10^12 J. Only 6.2 x 10^11 J of electrical energy is generated when the water is released. Calculate the efficiency of this energy storage scheme.
Answers
Explanation:
ake is 1.2 x 10^12 J. Only 6.2 x 10^11 J of electrical energy is generated when the water is released. Calculate the efficiency of this energy
Given info : The electrical energy used to pump the water up to the mountain lake is 1.2 x 10^12 J. Only 6.2 x 10^11 J of electrical energy is generated when the water is released.
To find : The efficiency of this energy storage scheme is ...
solution : we know, efficiency is given by, η = W/Q
where W is workdone and Q is energy of source.
here Q = 1.2 × 10¹² J and W = 6.2 × 10¹¹ J
now η = 6.2 × 10¹¹/1.2 × 10¹²
= 6.2/12
≈ 0.517
in percentage = η × 100 = 51.7 %
Therefore the efficiency of energy storage scheme is 51.7 % (approx ).
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