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Unit 7: Magnetism and Electromagnetism
7.2 The Motor Effect
7.2.2 Electric Motors
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Cards (59)
What is an electric motor used for?
Converts electrical to mechanical energy
The motor effect occurs when a current-carrying conductor is placed in a magnetic field.
True
The force in the motor effect is directly proportional to the
current
Steps explaining the motor effect
1️⃣ Current flows through conductor
2️⃣ Magnetic field interacts
3️⃣ Force exerted on conductor
4️⃣ Conductor moves
The force in the motor effect is zero when the angle between the conductor and the magnetic field is
parallel
Fleming's left-hand rule helps determine the direction of the force on a current-carrying conductor in a
magnetic field
.
True
In Fleming's left-hand rule, the thumb points in the direction of the
force
In Fleming's left-hand rule, what does the index finger indicate?
Magnetic field
What is the motor effect?
Force on a conductor
The current in the conductor is
directly
proportional to the motor effect force.
The rotor in an electric motor is a coil of
wire
What does Fleming's left-hand rule help determine?
Direction of force
The force in the motor effect is greatest when the conductor is parallel to the magnetic field.
False
Which finger in Fleming's left-hand rule points in the direction of the magnetic field?
Index finger
What is the angle between a conductor and a magnetic field when the force is greatest?
90°
The middle finger in Fleming's left-hand rule points in the direction of the
current
The strength of the motor effect force is directly proportional to the current in the
conductor
.
True
The length of the conductor in a magnetic field is
directly
proportional to the motor effect force.
The motor effect force is greatest when the conductor is parallel to the magnetic field.
False
Why does a current-carrying conductor experience a force in a magnetic field?
Interacting magnetic fields
What happens to the motor effect force if the magnetic field strength decreases?
Decreases
What is used to create the magnetic field in a DC electric motor?
Permanent magnet
The commutator in a DC electric motor ensures continuous
rotation
by reversing the current direction.
True
What is the term for the force experienced by a current-carrying conductor in a magnetic field?
Motor effect
Match the component of an electric motor with its description:
Power Source ↔️ Requires electrical current
Magnetic Field ↔️ Creates magnetic force
Rotor ↔️ Rotates when current flows
Commutator ↔️ Reverses current direction
What type of energy does an electric motor convert into mechanical energy?
Electrical energy
What are the four key features of an electric motor?
Power source, magnetic field, rotor, commutator
What is the motor effect?
Force on a conductor
What happens to the motor effect force if the magnetic field strength increases?
Increases
What force is experienced by a current-carrying conductor in a magnetic field?
Motor effect
The force is greatest when the conductor is perpendicular to the
magnetic field
.
True
What is the motor effect?
Force on current-carrying conductor
What happens to the motor effect force if the magnetic field strength increases?
Increases
Arrange the steps shown in the flowchart for Fleming's left-hand rule:
1️⃣ Current flowing into page
2️⃣ Magnetic field from left to right
3️⃣ Force upwards
The motor effect force is
directly
proportional to the current in the conductor.
Match the component of a DC electric motor with its description:
Power Source ↔️ Provides electrical current
Magnetic Field ↔️ Creates magnetic field
Rotor ↔️ Coil of wire that rotates
Commutator ↔️ Reverses current direction
The rotor in a DC electric motor is a coil of
wire
that carries the current and rotates.
Arrange the steps in how an electric motor generates motion:
1️⃣ Current-carrying conductor placed in magnetic field
2️⃣ Conductor experiences a force
3️⃣ Rotor begins to rotate
The conductor in an electric motor that carries the current is called the
rotor
.
The commutator in an electric motor ensures continuous
rotation
by reversing the current direction.
True
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