# Power Equations

### Table of Contents

- Introduction
- The Units of Measure
- Power
- Voltage
- Current
- A Triplet of Equations
- Simple Example
- How Big Does My Resistor Have to be?
- Its a Law Jim, but not as we Know it

### Introduction

In this blog post I will attempt to explain another triplet of equations that are very important to electronic theory.

These are the three equations we can use to calculate power, in Watts, when we know Voltage and current, Voltage when we know power and current, or current when we know power and voltage.