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State any four characteristic of good sources of energy.
A good source of energy should have the following characteristics:
a) It should do a large amount of work per unit mass or volume that means it should have high calorific value.
b) It should be easily accessible and provide energy over a long period of time. Example: coal and petroleum.
c) Should be easy to store and transport.
d) Safe and convenient to use - energy sources should be safe as it is used by a large number of people and should be convenient.