It sounds like you have a normal, inquisitive kitten. But chewing on electrical cords is quite dangerous. The good news is that he should start outgrowing this behavior soon.

Have you tried putting something distasteful on the cords? Cayenne pepper spray or bitter apple spray can deter some cats from chewing. Vicks Vaporub is an excellent deterent as cats seems to hate the smell and if they happen to take a taste the bitterness usually keeps them from going back for seconds.  You can also cover the cords with paper towel tubing or PVC pipe.

Also, make sure that your kitten has plenty of appropriate toys to play with. One way you can make his toys go further is to put a few out for him to play with, and put the rest away. A few days later, hide the toys that were left out, and leave out some new toys that had been put away. Even old toys will look new to your cat after they've been hidden for a few days.

With a bit of persistence, your kitten will start to leave the cords alone. If, in spite of all these precautions, you catch him chewing on the cords, chase him away with a squirt of water from a spray bottle. Don't yell at him or spank him; just calmly squirt him until he leaves the cords alone. Good luck with your kitten!