Owen Duffy wrote:
"Nothing like Vrms times Irms through it is it?"

Yes it is. Sorry I fat fingered (E=1ampere). It is I=1 ampere.

1 ampere times the 85 volts dropped across an 85-ohm resistor by 1
ampere = 85 watts, same as 1x1x85=85, or 85x85/85=85. All methods of
calculation must give the same answer, and they do if you don`t make a
mistake.

Best regards, Richard Harrison, KB5WZI