Coils of wire wrapped around a ferromagnetic core make up a motor's armature. It carries an electrical current and rotates within a magnetic field.
Coils of wire
A transformer.
"Electromagnet"
An electrical transformer.
This causes the power of the electromagnet to be increased.
Coils of wire
A transformer.
"Electromagnet"
An electrical transformer.
This causes the power of the electromagnet to be increased.
I believe what you are referring to is coils wrapped around power lines; I believe these are for damping purposes (to keep the wires from bouncing around).
Some DC motors.
Coils of wire
The strength of an electromagnet depends on: -- The magnitude of the current through the wire. (This depends on the voltage between the ends of the wire.) -- The number of turns of wire in the coil wrapped around the iron core.
It can be if it is wrapped up real tight. You are making a coil and coils produce resistance, and heat.
A core in the electrical trade usually refers to the iron laminations that coils of wire are wrapped around. The core directs the magnetic field, that the coils of wire produce when energized, into a working force. This could be the iron core of a relay or a transformer core that is the centre and principle reason that a transformer can operate.
All motors are made up of 2 basic parts, a coil or coils of wire, and two or more magnets. the motors found in cars and car windows contain dc motors that use a pair of brushes to make contact with the coils that in turn drive the magnet. as u continually use the motor, the brushes are worn away due to friction, once the brushs no longer make contact with the commutator (the copper plates where the brushes come in contact with the coils) the door motor with stop working as no current is able to pass through the motor. you either have to get the brushes replaced, or replace the motor entirely