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Questions and Answers
Which of the following devices utilize the electromagnetic force acting on a wire in a magnetic field?
Which of the following devices utilize the electromagnetic force acting on a wire in a magnetic field?
What is one way to increase the force acting on a wire in a magnetic field?
What is one way to increase the force acting on a wire in a magnetic field?
Fleming's left-hand rule helps to determine what aspect of the electromagnetic effect?
Fleming's left-hand rule helps to determine what aspect of the electromagnetic effect?
Which condition can result in no electromagnetic force acting on a wire carrying current in a magnetic field?
Which condition can result in no electromagnetic force acting on a wire carrying current in a magnetic field?
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What is produced around a conductor when a current flows through it?
What is produced around a conductor when a current flows through it?
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Which device uses a changing electromagnetic force to make a cone vibrate?
Which device uses a changing electromagnetic force to make a cone vibrate?
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What kind of particle experiences a force in a magnetic field?
What kind of particle experiences a force in a magnetic field?
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When drawing the left-hand rule, which finger is used to represent the direction of the magnetic field?
When drawing the left-hand rule, which finger is used to represent the direction of the magnetic field?
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What happens to the coil in an electric motor when the switch is closed?
What happens to the coil in an electric motor when the switch is closed?
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How can one make the coil in a motor spin in the opposite direction?
How can one make the coil in a motor spin in the opposite direction?
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What is indicated by the direction of the arrow on a magnetic field line?
What is indicated by the direction of the arrow on a magnetic field line?
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What would increase the speed of an electric motor's coil when it is switched on?
What would increase the speed of an electric motor's coil when it is switched on?
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When an electric motor's coil is spun manually and a lamp lights up, what does this indicate?
When an electric motor's coil is spun manually and a lamp lights up, what does this indicate?
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What does the left-hand rule help determine?
What does the left-hand rule help determine?
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What effect does placing a wire carrying current in a magnetic field have on the wire?
What effect does placing a wire carrying current in a magnetic field have on the wire?
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What would be an effective way to increase the force acting on a current-carrying wire in a magnetic field?
What would be an effective way to increase the force acting on a current-carrying wire in a magnetic field?
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Which change would allow an electric motor coil to turn faster?
Which change would allow an electric motor coil to turn faster?
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What change can be made to make the coil in a motor turn in the opposite direction?
What change can be made to make the coil in a motor turn in the opposite direction?
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What is the useful work done in lifting a load 0.80 m if the force used is 2.5 N?
What is the useful work done in lifting a load 0.80 m if the force used is 2.5 N?
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If the total energy transferred by the motor is 6.0 J, how much useful energy was transferred to lift the load?
If the total energy transferred by the motor is 6.0 J, how much useful energy was transferred to lift the load?
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What effect does a charged particle experience when it moves into a magnetic field?
What effect does a charged particle experience when it moves into a magnetic field?
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Why is the coil in a loudspeaker made of insulated wire?
Why is the coil in a loudspeaker made of insulated wire?
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When the current in a loudspeaker's coil changes direction, what happens to the cone?
When the current in a loudspeaker's coil changes direction, what happens to the cone?
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What does the abbreviation d.c. stand for in electrical terms?
What does the abbreviation d.c. stand for in electrical terms?
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Study Notes
Motor Effect
- A coil in an electric motor spins when the switch is closed due to the interaction between the magnetic field of the motor and the current in the coil.
- To reverse the direction of the coil spin, reverse the current or the magnetic field.
- Increasing the current or strength of the magnetic field will increase the speed of the coil spin.
- A magnetic field surrounds a current-carrying wire, changing the direction will impact the coil's spin direction.
Magnetic Field Lines
- Magnetic field lines show the shape of the magnetic field.
- The direction of the magnetic field lines is indicated by arrows on the lines.
- The field lines show the direction of force on a current-carrying wire within the magnetic field.
Electric Motor Operation
- A closed switch allows current to flow, creating a magnetic field around the coil.
- The interaction between the coil's magnetic field and the external magnetic field causes the coil to rotate.
- Replacing the cell and switch with a lamp will light the lamp when the coil is spun by hand, as the motion of the coil creates current.
- To make the motor spin faster, use stronger magnets, or a higher voltage
- To change the rotation direction, reverse the current or magnetic poles.
Magnetic Field Patterns
- The direction of an arrow on a magnetic field line indicates the direction of the field.
- Circular coil's magnetic field pattern is shown with arrows to demonstrate the field's movement.
Electric Motor Rule
- The rule students use to predict the direction of spin is related to the motor's wire interaction with the magnet.
Left-Hand Rule
- The left-hand rule is used to determine the force on a current-carrying conductor in a magnetic field.
- The rule uses the thumb to indicate the direction of force, the first finger to indicate the direction of the magnetic field, and the second finger to describe the direction of the current.
Loudspeaker Operation
- A coil interacts with a magnet's field to vibrate a cone and create sound.
DC Motors
- DC stands for direct current.
- DC motor uses the interaction between a current-carrying coil and a magnetic field.
Electromagnetic Force
- A wire carrying current in a magnetic field produces an electromagnetic force.
- The force can be increased by: increasing the current, and increasing the magnetic field strength.
- The force will be absent when the wire is parallel to the magnetic field.
Applications
- Electric motors use the production of electromagnetic forces, along with related principles and concepts.
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Description
Explore the fundamental concepts behind electric motor operation, including the role of magnetic fields and current in coil rotation. Understand how changes in current and magnetic field strength affect the performance of motors. Test your knowledge on motor effects and magnetic field lines.
