- V = I R (ohm’s law)
- P = I V
- resistors in series add together
- resistors in parallel equate to a smaller value (inverse of sum of inverses)
- voltage across all parts of a closed circuit sums to zero (kirchoff’s voltage law)
- sum of currents into a point equals sum of currents out of that point (kirchoff’s current law)
- current is the same at all points of a closed, non-branching circuit
ref