In 1968 I was a 16-year old cadet attached to the Royal Anglian Regiment Signals Corps. A grizzled sergeant was teaching us about the old "88 Set" radio, and told us that it was time we learned some basic electrical pragmatism. He wrote W-A-V and V-A-R in two triangles on a sheet of paper, and told us that if we cover up any of the letters with a finger, the formula is revealed by the remaining letters' relationship to each other: Watts = Amps x Volts; Amps = Watts / Volts; Volts = Watts / Amps; Resistance = Volts / Amps, etc.
He told us simply to remember Women Are Virgins, but Virgins Are Rare. I don't think any of us ever forgot that lesson.
On our Performance Oriented Electronic Training (POET) course, the instructors used this one for remembering resistor colour codes.
Be well...
