In wiring diagrams, what does the letter "W" stand for?

In wiring diagrams, the letter "W" typically stands for Watt, which is the unit of power in the International System of Units (SI). Watts measure the rate of energy transfer, equivalent to one joule per second. When analyzing electrical systems, understanding power ratings in watts is crucial, as it helps ensure that circuits and components are appropriately rated for the loads they will carry.

While wiring does play a significant role in these diagrams, the letter "W" specifically denotes the power measurement rather than elements like types of wiring or wire gauge. This distinction is vital for properly sizing circuits and understanding the electrical system's performance.