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In general a good source of energy would be one,
(i) which would do a large amount of work per unit mass or volume
(ii) which would be easily accessible.
(iii) which can be easily stored and transported.
(iv) which is also reasonably economical.
Classify the following as renewable and non-renewable sources of energy.
Coal, flowing water, geothermal energy, nuclear energy, biogas, natural gas, petroleum, ocean waves, wood, flowing wind, cooking gas, biomass, hydroelectric power.
'Replenishment of energy source like wood takes a long time but it is considered as renewable source of energy.' Comment.
What constitutes a source of energy?
State the two forms in which energy is mainly utilised at our homes.
When a body falls freely to the ground, its velocity reduces to zero and the sum total of kinetic energy and potential energy also becomes zero. Does it violate the law of conservation of energy?
Justify in one sentence that hydropower (hydro electricity) is a renewable source of energy.
What is a good fuel?
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