An Ohm’s Law chart usually features quadrants showing the formulas for determining the Ohm’s Law equation variables and the formulas for using Ohm’s Law to determine electrical power. Ohm’s Law states that resistance multiplied by current equals voltage. From this equation, algebraically equivalent statements for expressing resistance and current follow.
The formula for determining electrical power can also be calculated according to Ohm’s Law by substituting electrical power expressed in watts for voltage and replacing resistance with voltage, so power equals voltage multiplied by current, or P = V x I. From this equation, it follows that power equals current squared multiplied by resistance. This formula enables formulas for voltage, current and resistance to be stated using power. An Ohm’s Law chart typically features the formulas for each value - power, voltage, current and resistance - in individual quadrants arranged in a circular or pie-shaped chart.