Which is not part of an ac motor? magnet coil of wire commutator power source

Power source

Explanation:

In an AC motor, magnet, armature coil and commutators are used.

When an electric current passes through the coil placed in magnetic filed, it experiences a force. Due to this force, the coil starts rotating and then electrical energy converts into the form of mechanical energy.

Here always an power source be connected to the AC motor for the flow of current. So, power source is not the part of AC motor.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27