Final answer:
The requirements for various electric motors can be found in The National Electrical Code. Electric motors utilize torque generated by current-carrying wire loops in a magnetic field to convert electrical energy to mechanical work. Doubling the number of coils in the motor will double the torque produced.
Step-by-step explanation:
The requirements for torque motors, shaded-pole motors, and AC adjustable-voltage motors can typically be found in The National Electrical Code (NEC). The NEC is a widely adopted standard for the safe installation of electrical wiring and equipment in the United States, which includes specifications for electric motors.
Motors are applications of magnetic forces on current-carrying wires that convert electrical energy into mechanical work. When current is passed through wire loops within a magnetic field, a torque develops on the loops, causing rotation. This rotation, facilitated by the interactions of the magnetic field and electric current, defines the operational principle of an electric motor, as exemplified in figures depicting simplified versions of DC electric motors.
Torque in an electric motor can be calculated using the equation T = NIAB sin θ, where T is the torque, N is the number of turns in the wire loop, I is the current, A is the loop's area, B is the magnetic field strength, and θ is the angle between the area vector of the loop and the magnetic field. If the number of coils is doubled, the torque will similarly double according to this equation.