Noble gases are frequently used in tubes for many purposes, from lighting to switching. Pure noble gases are employed in switching tubes. Noble-gas-filled thyratrons have better electrical parameters than mercury-based ones.
The first electric motor able to turn machinery was built by William Sturgeon in 1832. In 1821, Michael Faraday built a machine that made a piece of metal move due to the flow of electricity. Although the amount of motion was small, this was the first published design of an electric motor. All subsequent developments in the use of electricity to make motors work came out of this invention. The first electric motor able to turn machinery was built by William Sturgeon in 1832.
Simply put, an electric motor can be defined as a machine that converts electrical energy into mechanical energy. The first electric motors date back to 1740s when Scottish monk Andrew Gordon created electrostatic devices.s mentioned, the electric motor relies on electromagnetism. Upon placement of a coil carrying current (rectangular coil) in a magnetic field, a torque is generated that acts on the coil and forces it to rotate continuously.