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Kilowatt (kW)

The kilowatt (symbol: kW) is a unit of power in the International System of Units (SI) equal to 1,000 watts:

Kilowatts are widely used to measure the power consumption or output of household appliances, small engines, and electric tools. For example, a typical microwave oven might use about 1 kW of power.

In electricity billing, power usage is often measured in kilowatt-hours (kWh), which reflects energy consumption over time.

The kilowatt is a practical unit for everyday energy use, bridging the scale from watts (for small devices) to megawatts (for larger power generation). It helps people understand and compare the power ratings of common electrical equipment.

Water Horsepower (WHP)

Water horsepower (WHP) is a unit used to measure the actual power delivered by water in hydraulic systems, such as pumps or turbines. It represents the useful power available from moving water.

Water horsepower is defined as:

or in more general terms, it can be expressed as:

where 550 ft·lbf/s equals 1 mechanical horsepower.

This unit helps engineers understand how much power is available from water flow to do useful work, like turning a turbine or driving a pump.

Water horsepower differs from mechanical or electric horsepower by focusing specifically on power derived from water movement in hydraulic contexts.