Who found new ways to use electricity?

If you're talking about DC vs AC, the man who found the most ways to use electricity and should be considered one of the founders of modern electricity is Nikola Tesla. Despite what many schools teach, Thomas Edison did not invent the light bulb. Nikola Tesla was the original inventor, Thomas Edison only adjusted it to be "sellable." Thomas Edison was an entrepreneur, not a scientist. He was interested in making money, not creating things.

Nikola Tesla is practically the founder of all modern electricity, before Tesla we were using DC, which is direct current. This method was very inefficient, and required lots of power plants. Meanwhile, AC or alternate current, invented by Nikola Tesla, was much more efficient and it did not require a power plant every couple of blocks. Tesla even had a wireless version of the electricity - however Edison could not think of a way to make profit off of this, and therefore it was not implemented.

To name a few of Tesla's inventions; radio, x-ray, radar, light bulb, remote control, electric motor, robotics, laser, and wireless. Many of his inventions were not implemented until later dates, and by people other than him over time who just did some tweaking.