Energy, Work, and Power
Power is a measure of the rate at which energy is used. Thermal power is the term
used to refer to the transfer of heat. Mechanical power is the term used to describe
when work is being done.
DEFINE the following terms:
STATE the mathematical expression for:
For a mechanical system, CALCULATE energy, work, and
Power is defined as the amount of energy used per unit time or rate of doing work. It has the units
of watt, Btu, horsepower, or ft-lbf/sec.
Thermal power is the measure of thermal energy used per unit time. It is the rate of heat transfer
or heat flow rate. Examples of thermal power units are British Thermal Units (Btu) or kilowatts
(Kw). Thermal power is calculated basically by the mathematical expression of:
Thermal energy and calculations of thermal power will be covered in more detail in the Fundamentals
Manual for Heat Transfer, Fluid Flow, and Thermodynamics.