Is the speed of light is equal to the speed of electron in current?
No. The speed of light in a medium can be seen as the speed at which electrons ‘communicate’, if you know what i mean. Picture yourself electrons as cars on a street: The (drivers of the) cars see each other and react to each other, if the one in front of you breaks, you will break too after light has brought you that information. If they accelerate you will accelerate as well. Again the speed of the information is the speed of light. That does not mean the cars travel at the speed of light, they go much slower, mainly because of resistance. edit: The drift velocity of electrons in a ‘normal’ electric circuit is not even near the speed of light. It depends on the resistance and voltage and stuff but it is around millimeters per second or even less. But free electrons are able to go much faster and come close to c, it is just a matter of how much energy you put into accelerating them. I do not know, why people write something about 1/10 of c.
