basics
VAC
VAC stands for Voltage in Alternating Current. VAC describes a periodic switch in the polarity in equal shares in the negative and positive range. The average over time for the alternating current is thus nil. A typical example of a sine wave-shaped alternating current is the 230V domestic power network.
WEEE
The WEEE guideline is an EU guideline intended to reduce the volume of electronic scrap. It also regulates the environmentally friendly disposal of waste. The WEEE specification came into effect together with ROHS. WEEE stands for Waste Electrical and Electronic Equipment.
Watt
Watt is a unit of power and is expressed with a capital W. The Watt is an SI unit and is named after physician James Watt. In physics equations the power in watt is indicated through the letter "P".