Watt

(W) a unit of power that is the rate of WORK done at I JOULE per second, i.e. I W = 1 Js^-1.

Taken from Dictionary of Science

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The watt is a derived unit of power in the International System of Units (SI), named after the 18th-century Scottish engineeer James Watt. Its unit symbol is W. The unit measures the rate of energy conversion.

• One watt is equal to 1 joule (J) of energy per second.

• In terms of mechanical energy, one watt is the rate at which work is done when an object is moved at a speed of one meter per second against a force of one newton.

1W = 1Js^-1 = 1kgm²s^-3 = 1Nms^-1

• By the definitions of electric potential (volt) and current (ampere), work is done at a rate of one watt when one ampere flows through a potential difference of one volt.

1W=1V×1A

Taken from Wikipedia

Macrophage

a special type of cell that forms part of the IMMUNE SYSTEM of vertebrates. Macrophages are derived from MONOCYTES in the blood system and can move to infected or inflamed areas of the body using PSEUDOPODIA. In these areas, they surround, engulf and degrade broken cells and other debris, including microbes, by means of the process called PHAGOCYTOSIS.

Taken from Dictionary of Science