The Earth receives an incredible supply of solar energy. The sun, an average star, is a fusion reactor that has been burning over 4 billion years. It provides enough energy in one minute to supply the world's energy needs for one year. In one day, it provides more energy than our current population would consume in 27 years. Solar energy is a free, inexhaustible resource, yet harnessing it is a relatively new idea.
What is the definition of the units by which energy is measured? Energy provided by food and beverages is measured in kilocalories, abbreviated kcalories or kcal. One kcalories is the amount of heat nessary to raise the temperature of 1 kilogram of water 1'C. The scientific use of the term kcalorie is the same as the popular use of the term calorie. Calories.
Power factor is the ratio between active power and apparent power. The power supplied by us is called apparent power (kVA). Apparent power is broken down into active power (kW), and reactive power (kVAR). Active power provides energy for motion, heat, light and sound.