What is the difference between Buck converter and linear voltage regulator - practical comparison - Electrical Engineering

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What is the difference between Buck converter and linear voltage regulator In this video I'm comparing in practice a buck convert...

What is the difference between Buck converter and linear voltage regulator - practical comparison

What is the difference between Buck converter and linear voltage regulator
What is the difference between Buck converter and linear voltage regulator
In this video I'm comparing in practice a buck converter with LM7805 linear voltage regulator. Two driver boards from old hard drives are used as a dummy load to check efficiency and temperature of the buck converter and linear voltage regulator. I'm presenting pros and cons of both devices.
There are 2 mistakes in my calculations: 
1. 5:02 - 5:08 - correct calculations should be: (12V - 5V) x 0.42A = 2.94W 
2. 5:17 - 5:23 - correct calculations should be: (12V - 5V) x 0.22A = 1.54W I double checked everything, but I should have triple checked. I'm sorry for my mistake.

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