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Sources Of Energy

Question

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Explain the classification of different sources of energy?

Solution

Energy sources can be classified as:

(i) Non-renewable resources: The sources of energy which are produced under special circumstances over millions of years due to slow changes. The process involved is not continuous.
E.g., Fossil fuels like coal, petroleum and natural gas are non-renewable energy sources. With the present rate of their consumption, it is estimated that known deposits of petroleum in our country will be exhausted in another 200 years and that coal may last for another 250 years.

(ii) Renewable sources: The sources of energy which can be harnessed into energy so long as the earth derives its heat and light from the sun are renewable sources.
E.g., flowing water, wind, tides, ocean waves and biogas are examples of renewable sources. Wood is also a renewable source of energy.

Some More Questions From Sources of Energy Chapter

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.

What is a good source of energy?

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