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
Four sources of energy used in the activity is:
1. Energy of muscles
2. Chemical energy of petrol or diesel
3. Chemical energy of gas or kerosene
4. Electrical energy obtained from potential energy. Electrical appliances of water, chemical energy of fuels etc.
What are the characteristics of a good source of energy?
Name the source of energy in sun and stars.
