Today we can see that the Google Doodle logo is showing an image representing electromagnetism. Google is showing this image for celebrating birthday of Hans Christian Ørsted. who was born on August 14 1777. For many his name is not known but one of his experiments was instrumental in the development of electricity.
He is a Danish physicist & chemist.
He has initiated the concept of electromagnetism. i-e He found that there is some relation between magnetism and electricity.
It is the basis for invention of Electricity Generators and Transformers.
According to the national Museum of Denmark, Ørsted is poet too. He actively contributed to the modernisation of the Danish language.
It seems Google is showing interest to spread knowledge/information about historic persons and Scientists.
Guardian says that "Probably not even the physics geeks remember much about Hans Christian Ørsted, although Google's Doodle logo illustrates his key discovery"
Mashtable says "Google’s “doodles”, their creative renderings of the Google logo celebrating famous figures and significant events, have the ability to draw worldwide attention to under-appreciated historical figures".
You can read more about Orsted from Wikipedia..
The basics of electromagnetism is "A changing magnetic field produces an electric field and similarly, a changing electric field generates a magnetic field.