Module 2 : Transmission Lines
Lecture 4 : Physical Interpretation of Voltage & Current Solution
  Forward Travelling Wave

Combining now the space-time we get what is called the 'Wave Motion'. See Figure. The voltage pattern appears travelling from left to right.

The first term of the voltage solution represents a voltage travelling wave in direction (left to right), and gives the amplitude of the wave at .  We call this wave, the ' Forward Travelling Wave '