FAQ Please support WebConX by visiting this sponsor. Frequently Confused Concepts I will attempt to provide a glossary of terms used in the energy, renewable energy, and electronics industries, as well as conversion formula's , and related FAQ's . At some point in the future I'll try to enable a database with search capability. Power is the rate of energy release at a given instant in time. Energy is power integrated over time.
Power is measured in watts, kilowatts and horsepower.
4.18 joules equal 1 calorie, which is enough energy to raise the temperature of one gram of water by one degree Celsius. One BTU equals 1,055 joules. Horsepower is defined as the amount of energy or work required to raise a weight of 33,000 pounds a height of one foot in one minute of time or to overcome or create a force which is equivalent to doing that amount of work. Therefore in simplified terms, a horsepower is 33,000 foot pounds of work done in one minute. However, horse power may be required at various power points of the engine and the calculation must be accordingly.