Someone sprayed insecticide next to my house, so my room smelled pretty bad and i turned on all the fans in my room, which reminded me of the motors from last quarter. the motors converted electrical energy into mechanical energy by using magnets and current. because current in a wire is caused by the movemnt of electrons, which ar charged particles, the magnet will either repel or pull a wire in a certain dirction. if the the wire is coiled, it can be forced to spin around an axis by rapidly switching the direction of the current so that the electron flow always goes in a certain direction relative to the magnetic field. This made me wonder though. Since my fan can operate at different speeds, that means that the current must switch directions at different rate, or the force on the coil would not be constant in direction and magnitude. So there must also be some form or current regulator in the system as well, which can actively control how fast the current switches.
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