Question

 A vacuum cleaner is plugged into a 120.0-V socket and uses 3.0 A of current in normal operation when the back emf generated by the electric motor is 72.0 V Find the coil resistance of the motor?

Answer Stable voltage across the motor = (120 - 72) = 48 VR = E / I = 48/3 = 16 ohms.(Assumes power-factor of 1, no reactances, back-emf in phase with the line, etc.)
http://wiki.answers.com/Q/A_vacuum_cleaner_is_plugged_into_a_120.0-V_socket_and_uses_3....

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