I show how to find the phase of a wave and phase difference of two waves. Phase difference is a way of comparing two waves which otherwise share the same properties. Waves can be understood as graphs of circles, so we can use the angle properties of circles to describe differences between waves. I show why the formula for the angle of a phase works and how to use it.

0:00 Why Phase Difference is Important
0:29 Connection Between Waves and Circles
1:04 Using Angles to Describe Waves
2:11 Angles as Fractions of Waves
2:56 Definition of Phase Difference
3:26 Example 1 - Displacement-Position Graph
3:57 Example 2 - Displacement-Position Graph
4:18 Example 3 - Displacement-Time Graph
4:42 Simple Harmonic Motion Example 1
5:37 Simple Harmonic Motion Example 2
5:55 Negative Phase Difference

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