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Sources Of Energy

Question

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What are the characteristics of a good source of energy?

Solution

Characteristics of a good sources of energy are:

(i) it should give an adequate amount of net energy or work per unit volume or mass,
(ii) it must be convenient to use so as to give energy at a steady rate,
(iii) it must be easy to store and transport,
(iv) it must be economical, and
v) it must be easily accessible.

Some More Questions From Sources of Energy Chapter

Energy can neither be created nor destroyed. Then why is there so much fuss about energy crisis?

List any four sources of energy which are selected for use for a given activity.

1. Energy to run a cycle
2. Energy to run a car
3. Energy to cook food
4. Energy to work on

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.

What is meant by the transformation of energy? Explain giving an example.

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?

Write two advantages of classifying energy sources as renewable and non-renewable.

Justify in one sentence that hydropower (hydro electricity) is a renewable source of energy.

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