Very nice animated film which is 5 minutes long,showing the basics of computer programming from Brainpop. Some of this site does require a login but it has some great programming activities and https://www.brainpop.com/technology/computerscience/computerprogramming/

Here is another one from DK Learning called Thinking Like a Computer

http://www.dkfindout.com/uk/video/computer-coding/think-like-computer-video/