##### Work, energy and power

Work is done (or energy is transferred) when an object is moved against a force, and is defined as:

In the Imperial fps system expression 1.5 gives a unit of ft lb f. For metric systems the unit is cm kg f. The SI unit of work is the joule, where 1 J = 1 N m (= 1 m2 kg s−2). Table 1.8 compares these, and other, units of work.

Power is the rate at which work is performed:

### Related posts:

Case studies:VSD in a wastewater pumping scheme

Compressed Air Transmission and Treatment:Water vapour

Air flow rate evaluation:Supply pressure and Volumetric flow rate.

HYDRAULIC PUMPS:Centered Internal Gear

THE COMPRESSOR:AIR RECEIVERS

Optimizing and up-rating of existing systems:The influence of changing pipeline diameter

ROUBLESHOOTING PNEUMA TIC CIRCUITS:PNEUMATIC SYSTEM COMPONENT fAILURE MODES

ROUBLESHOOTING HYDRAULIC SYSTEMS:ISOLATING PROBLEMS IN A HYDRAULIC CIRCUIT

ACTUATORS:PISTON Roo COLUMN STRENGTH AND HYDRAULIC CYLINDER FORCES.

Hydraulic fluids:Neutralization number

Control valves.

SUMMARY OF PROPERTIES OF PURE SUBSTANCES

POWER AND REFRIGER A TION CYCLES:AN OVERVIEW OF RECIPROCATING ENGINES

POWER AND REFRIGER A TION CYCLES:THE IDEAL VAPOR-COMPRESSION REFRIGERATION CYCLE

RADIATION HEAT TRANSFER:RADIATION SHIELDS AND THE RADIATION EFFECTS