Electrical current that flows is bi directional.

Alternating current is a form of electricity in which the current alternates in direction (and the voltage alternates in polarity) at a frequency defined by the generator (usually between 50 and 60 times per second, i.e., 50 – 60 hertz)

An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current.

A light metal of a good resistance to atmospheric corrosion. It is used as the base metal for light alloys.

Aluminium alloyed with materials such as copper, manganese, silicon or magnesium, to improve their strength.

Brass containing up to 6% aluminium in order to improve resistance to corrosion.

A copper aluminium alloy containing 4-11% of aluminium and other elements for particular properties. It is used for propulsors, valve fittings and other applications where corrosion resistance is important.

Aluminium conductor steel-reinforced cable (ACSR) is a type of high-capacity, high-strength stranded conductor typically used in overhead power lines.

ACCC (Aluminum Conductor Composite Core) is a registered trade mark for a type of "high-temperature low-sag" (HTLS) overhead power line conductor.

Natural condition of the environment at any given time.

The surrounding air (usually outdoor air or the air in a specific location).

Parameters such as barometric pressure, engine room and seawater temperatures and relative humidity to be taken into account while designing ship’s machinery.

Environmental conditions that the crew is exposed to during periods of work, leisure or rest.

The natural temperature of the earth in a specific location.

The American National Standards Institute is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States.

The American Petroleum Institute (API) is the largest U.S. trade association for the oil and natural gas industry.

American Wire Gauge, also known as the Brown & Sharpe wire gauge, is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire.

1. A nautical term, which refers to the longitudinal centerline of a ship. 2. In ship construction amidships is in the middle of the length (L).

An ammeter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A).

Noxious, pungent gas, extremely soluble in water and alcohol. It is used as a refrigerant. Further Ammonia is used as feed stock in e.g. fertilizer production and several other industries.