This document contains calculations for current (I), resistance (R), and power (P) in various circuits. It provides the values for two variables and calculates the third. For example, it gives I and V to find R, or R and I to find V, or P and I to find R. The circuits cover a range of voltages from 5V to 120V and currents from 0.025A to 12A, with resistances from 1.2kOhms to 100Ohms and powers from 0.625W to 500W.