| |
|
|
| |
 |
| Sources of Heat |
|
| Sun is a natural source of energy. Solar heat energy is essential for the survival of all forms of life on earth. Solar energy is considered as an alternate source of energy. |
| |
 |
| |
| Sun, the natural source of energy |
| |
| We derive heat energy by burning fuels like coal, charcoal, wood, kerosene, petrol, etc. Electricity is another source of heat energy. Electrical energy is converted to heat energy and thus, used as a source of heat energy. |
| |
|
|
| |
|
|
| |
|
|
|
