Title: Module 7: Ohm's Law Calculations
Course: Basic Electrical Theory and Wiring (Sandbox) > Section: Module 7: Ohm's Law

Introduction

Now that you understand Ohm's Law and the different variables that go into the calculations, here are the equations you need to know and can reference later.

 | Formulas: Finding Voltage |
\(V=R\times I\)

\(V=\frac{P}{I}\)

\(V\:=\:\sqrt{P\times R}\)

 | Formulas: Finding Resistance |
\(R=\frac{V}{I}\)

\(R=\frac{V^2}{P}\)

\(R=\frac{P}{I^2}\)

 | Formulas: Finding Current |
\(I=\frac{V}{R}\)

\(I=\frac{P}{V}\)

\(I=\sqrt{\frac{P}{R}}\)

Variable Key

- V = Voltage in volts (V) (This can also be displayed as E for electromotive force)
- I = Current in amps (A)
- R = Resistance in ohms (Ω)
- P = Power in watts (W)

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