Electromagnets in Garbage Disposal

          The garbage disposal was invented in 1927 by a guy named John W. Hammes, they were originally called "electric pigs" and didn't become a normal thing to have until around 50 years after they hit the market. Although the original design was much less effective and smooth as it is now, the basic principles of the garbage disposal using electromagnets is still there.
          The garbage disposal uses a high torque insulated electric motor that rotates at around 1,400-1,500 RPM, this rotation is attained by the magnetic principals of the electric motor. The electrical motor has a voltage source, a shaft, an electromagnet, and at least one additional magnet. When current from the voltage source flows through the coil, a magnetic field is produced around the electromagnet. The like fields or "poles" of the magnets repel each other (Coulomb's law)cause the motor to turn at this accelerated rate.
           The garbage disposal is used to cut up food scraps into more easily moveable and disposable pieces that can be more easily disposed of in the sewer. Although the motor in garbage disposals spins extremely fast, it is not strong enough to cut up things like spoons or knives (however it will definitely cut your finger up so please don't put your fingers in there!!)
Sources: http://www.classzone.com/vpg_ebooks/sci_sc_6/accessibility/sci_sc_6/page_540.pdf?scrlybrkr=900d5b26
https://en.wikipedia.org/wiki/Garbage_disposal_unit