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Why must the direction of the current in a motors electromagnets be switched repeatedly?
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.
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How can electromagnets be controlled?
Electromagnets can be controlled by adjusting the amount of current flowing through the wire coils. Increasing the current strengthens the magnetic field, while decreasing the current weakens it. Alternatively, changing the direction of the current flow can reverse the polarity of the electromagnet.
What are the advantages of electromagnets against normal magnets?
Electromagnets' magnetism can be manipulated. Electromagnets can be magnetised and demagnetised by passing electric current. Therefore they are used in motors- which works when the coil is magnetised by passing an electric current. It is also used for cranes.
In order to reverse the direction of current in a motor what does the current conduct?
To reverse the direction of current in a motor, the current conducting wires must be switched. By changing the configuration of the wires, the flow of current through the motor's coils can be reversed, thereby changing the direction of rotation of the motor.
When current passes through a wire?
When current passes through a wire, it creates a magnetic field around the wire. The direction of the magnetic field is determined by the direction of the current flow. This principle is the basis for electromagnets and various applications in electrical devices.
How can electro magnets be controlled?
Electromagnets can be controlled by adjusting the amount of electric current passing through the wire coil. Increasing the current strengthens the magnetic field, while decreasing the current weakens it. Additionally, the direction of the magnetic field can be controlled by changing the direction of the current flow through the coil.
What is the only time that electromagnets magnetise?
Electromagnets are only magnetised while the electrical current is switched on.
Electric current in which electrons repeatedly change direction?
AC
What types of current changes direction repeatedly?
AC current (alternating current) like in a wall outlet
What is an alternating circuit?
an electric current that changes it direction or strength repeatedly
How can electromagnets be controlled?
Electromagnets can be controlled by adjusting the amount of current flowing through the wire coils. Increasing the current strengthens the magnetic field, while decreasing the current weakens it. Alternatively, changing the direction of the current flow can reverse the polarity of the electromagnet.
What are the advantages of electromagnets against normal magnets?
Electromagnets' magnetism can be manipulated. Electromagnets can be magnetised and demagnetised by passing electric current. Therefore they are used in motors- which works when the coil is magnetised by passing an electric current. It is also used for cranes.
Electric current changes direction repeatedly is called?
AC current (alternating current) like in a wall outlet
In order to reverse the direction of current in a motor what does the current conduct?
To reverse the direction of current in a motor, the current conducting wires must be switched. By changing the configuration of the wires, the flow of current through the motor's coils can be reversed, thereby changing the direction of rotation of the motor.
When current passes through a wire?
When current passes through a wire, it creates a magnetic field around the wire. The direction of the magnetic field is determined by the direction of the current flow. This principle is the basis for electromagnets and various applications in electrical devices.
In direct current charges carries have a drift velocity but in alternating current there is no net velocity of the charge carriers. Explain why?
In direct current the charge carries always flow in the same direction, while in alternating current they change direction repeatedly, meaning overall there is no net direction.
How can electro magnets be controlled?
Electromagnets can be controlled by adjusting the amount of electric current passing through the wire coil. Increasing the current strengthens the magnetic field, while decreasing the current weakens it. Additionally, the direction of the magnetic field can be controlled by changing the direction of the current flow through the coil.
What are 5 facts about electromagnets?
Electromagnets are created by passing an electric current through a coil of wire. They can be turned on and off by controlling the flow of electricity. The strength of an electromagnet can be increased by adding more coils of wire or increasing the current. Electromagnets are used in a wide range of devices, from speakers and electric motors to MRI machines. The polarity of an electromagnet can be reversed by changing the direction of the electric current.
