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Why is it necessary to change the directions of the current in the coil of an electric motor as it turns?
The magnetism set up in the motor, attracts opposite poles. One pole is in the rotor and the the other on the stator. The attraction causes the rotor to turn. If allowed to continue, the pole will get as close as possible and then stop. The motor will stall.
On a brushed, DC motor, the commutator acts as a switch and turns off the nearest coils and connects the next one along, allowing continuous rotation.
On an AC motor, the supply is changing direction, this acts in synchronization with the rotation.
What else can I help you with?
How can electric current change?
In order to change an electric current, you must first change the conductor, doing so will change the flow of atoms which will change the electrical discharge.
How can the flow of electric current be started and stopped?
Electric current can be started by closing a circuit, allowing the flow of electrons. This can be done by pressing a switch to complete the circuit. To stop the flow of electric current, the circuit needs to be opened, typically by opening the switch, which interrupts the flow of electrons.
Do magnetic effect of electric current causes a change in colour in a solution through which electric current is passed?
i don't believe it does
Electric current in which electrons repeatedly change direction?
AC
What most occur to produce electric current?
Chemical changes, change in magnetic flux linked with a conductor cause the production of electric current.
How does the increase or decrease of potential difference affect the flow of the electric current?
Increase or decrease in potential results in the change in direction of the flow of electric current.
What is constant electric current?
That means it doesn't change over time.
Does increased current flow change the sound of an electric buzzer?
yes
Does a change in magnetic field induce an electric current?
Yes, a change in magnetic field can induce an electric current in a conductor, as described by Faraday's law of electromagnetic induction. When a magnetic field through a conductor changes over time, it creates an electromotive force, which leads to the generation of an electric current in the conductor.
Will there be an induces electric current if the magnet remains at rest?
No, there will be no induced electric current if the magnet remains at rest relative to the conductor. Movement or a change in magnetic field is required to induce an electric current in a nearby conductor through electromagnetic induction.
Does current effect the resistance in an electric series circuit?
The resistance remains constant. The voltage would change, in accordance with Ohms' law, with a change in current.
Does an electric current produces a magnetic field?
yes*edit: don't confuse moving with changing. A change in magnetic field strength/direction will induce an electric current.
