Dr Rajiv Desai
An Educational Blog
THE ENERGY
THE ENERGY Energy is defined as a capacity/ability to do the work and it is measured in Joules. Power is defined as the rate at which the work is done which means work divided by time and it is measured in Watts. 1 watt= 1 joule per second. 1 Giga-joule(GJ)= 1 billion joules 1 Exa-joule(EJ)= 1 billion GJ. 31.7 watts= 1 GJ per year. 1 kilo-calorie= 4.2 kilo-joules. 1 kilo calorie is the amount of energy required to raise the temperature of 1 kg of water by 1 degree celsius. Calorie is the unit of energy in nutrition. Human being needs 2000 kilo calories of energy through food for all activities per day which is equivalent to 90 watt light bulb. Energy makes change and does things for us.Energy lights homes, cooks food,runs car/fan/AC/heater/machines/TV etc.We will go back to stone age if there is no energy. First industrial revolution was […]
