Which came first, the generator or the electric motor?
We now live in the electrical age, and our lives and production are inseparable from electricity. So, which came first, the generator or the electric motor?
Logically, generators should come before motors, but that's not the case. Historically, motors appeared first, and then generators came into being.
However, large, practical electric motors and generators are constantly being developed and improved through a process of competition and mutual encouragement.
It should be noted that the earliest electricity used by mankind was not generated by generators, but by voltaic piles.
Before the 19th century, people's understanding of electricity was limited.
In 1821, Danish physicist Johann Oersted discovered the magnetic effect of electric current: a current-carrying conductor will move in a magnetic field. This provided the theoretical basis for the invention of the electric motor. Oersted's experimental apparatus is considered the most primitive electric motor.
When this great discovery was first exhibited, some people asked dismissively: What's the use of this thing?! The scientist cleverly retorted: What's the use of a newborn? Indeed, this baby soon grew into a giant.
In 1834, German physicist Jacobi created the first practical DC motor by using an electromagnet as a rotor.
In 1838, American Nikola Tesla invented the AC motor. This motor was simple in structure, small in size, and easy to use, and it was widely used.
From the perspective of energy conversion, an electric motor is a machine that converts electrical energy into kinetic energy.
The electric motor has been invented, making the widespread use of electricity possible.
However, at that time, the generators were all DC, with low power output and relatively high cost. Using them as a power source had almost no commercial value or practical significance.
In 1850, electricity was 25 times more expensive than steam, prompting people to search for other sources of electricity. Scientists, using reverse thinking, hypothesized that since electrical energy could be converted into kinetic energy, could kinetic energy also be converted into electrical energy. To this end, scientists conducted bold experiments and extensive practical work.
Ten years after the discovery of the magnetic effect of electric current, in 1831, British physicist Faraday discovered the law of electromagnetic induction (when a conductor moves in a magnetic field and cuts magnetic lines of force, an electric current is generated in the conductor), which provided the theoretical basis for the manufacture of generators.
After taking that difficult first step, Faraday continued his research and, two months later, successfully built the first true generator capable of producing a steady current, marking humanity's transition from the steam age to the electrical age.
Faraday's law of electromagnetic induction revealed the possibility of converting kinetic energy into electrical energy, paving the way for the development of generators. Various generators began to appear and evolve, and electricity began to become readily available and inexpensive. Electricity began to dominate socio-economic life as a new form of energy. Over the past century, many modern forms of power generation have emerged, including wind power, hydropower, thermal power, geothermal power, tidal power, solar power, and nuclear power. Generators have also become increasingly sophisticated and efficient, but the fundamental principle remains Faraday's law of electromagnetic induction…
