physics-energy conservation

some people refer to heat as "low grade energy.
a)how is low grade energy different from high grade energy?
b)give two example of high grade energy


When heating a cup of tea, which would be preferable...a stove with a burner on top, or a heating pad? High grade energy is energy that releases heat at high temperatures. Some add...without the release of pollutants..

oh i get it!thanks!

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asked by Emma

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