Unusual question.

[Mathmasteriw]

Hi Guys and Girls,
These 2 questions I have look unusual to me. I havent seen a letter in brakets next to the equation before. Is this just something for the assessor or part of the equation?
Thanks

 

[Cubist]

In this context I think that the [A] and [W] represent Amps and Watts

 

[Mathmasteriw]

Ah of course ! Makes sence now! Thank you!