Oh come now, guys- you all know better than to look at a meter and believe P=IE and E=IR, that's as much a half-true myth as the Bohr model of the atom or newtonian physics. Not to mention the OP apparently fully understood the answer after the first response- that's just not right! This is the theory forum, needs more differential equations!
dP=dIdE
dE=dIdR
Or at least use the AC version instead of DC for rule-of-thumb calculations:
P=I^2R
P=E^2/R
dP=dIdE (??????????), to simply.
1.
P=EI1.
P+dP = (E+dE)(I+dI) =
EI + EdI+IdE+dEdI so:
dP=EdI+IdE+dEdI am I wrong?
