In the early 1800s, coal and steam drove the machines of industry. By the late 1800s, new kinds of energy were coming into use. One was gasoline, which powered a new type of engine called an internal combustion engine. Small, light, and efficient, this engine would eventually make electricity. In the 1870s, the electric generator was developed, which produced a current that could power machines. This invention made it possible to bring the magic of electricity into daily life.
If electricity seemed like magic to people in the 19th century, Thomas Edison was perhaps the century's greatest…
