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An electric motor converts electric energy into mechanical energy that can be used to do work. In the experiment we first use DC current to flow through the wire. Remember that DC current flows in only one direction unless there is a switch to reverse its direction.
Therefore, the universal motor does not have a role to play in modern electric traction (although universal motors were used in early AC applications in locomotives); rather it is the induction motor that is the AC motor to which one refers when speaking of AC traction motors today.