A person is filling a knee-high bucket with water using a garden hose and holding it such that water discharges from the hose at
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The electrical efficiency is defined as the ratio between the useful power output and the total power input:
In our problem,
(power generated by the solar panel) and 
(power hitting the surface of the solar panel), therefore the efficiency of the panel is
which corresponds to 30%.
In our problem,
which corresponds to 30%.