Examlex
Choose one threat to internal validity, define and describe it then discuss what a researcher can do to avoid or minimize it.
Locked-Rotor Starting
A method of starting electric motors where the rotor is prevented from turning initially, causing high starting torque and current.
Induction Motor
An electric motor that operates by inducing an electromagnetic field in the rotor, rather than through direct electrical connection.
Synchronous Speed
The speed at which the magnetic field in an AC motor rotates, directly related to the frequency of the current supply and the number of poles in the motor.
Magnetic Field
An area surrounding a magnetic substance or an electric charge in motion, where magnetic force is exerted.
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