7.2.2 Electric Motors

• What is an electric motor?

  Converts electrical to mechanical energy
• The motor effect occurs when a current-carrying wire in a magnetic field experiences a force
• Arrange the steps in how an electric motor converts electrical energy into kinetic energy.

  1️⃣ Electrical current flows through armature coils

  2️⃣ Motor effect generates a force

  3️⃣ Armature rotates due to the force

  4️⃣ Electrical energy is converted into kinetic energy
• The speed of rotation in an electric motor is affected by the strength of the magnetic field.
• Fleming's left-hand rule is used to determine the direction of the force in the motor
• What is the role of a commutator in a DC electric motor?

  Reverses current direction
• An electric motor works based on the principle of the motor effect.
• What is the formula for the force acting on a current-carrying wire in a magnetic field?

  $F =$$BIL$
• Unlike generators, electric motors convert electrical energy into mechanical
• Match the feature with the correct device:

  Converts electrical energy to mechanical energy ↔️ Electric Motor

  Converts mechanical energy to electrical energy ↔️ Generator
• What is the role of the armature (rotor) in an electric motor?

  Carries coils, interacts with magnetic field
• The commutator in an electric motor reverses the current direction to maintain continuous rotation.
• What is the equation for the force generated in an electric motor due to the motor effect?

  $F =$$BIL$
• The coil in a simple electric motor is also known as the armature
• Arrange the components of a simple electric motor in the order of their interaction.

  1️⃣ Power Source supplies electrical current

  2️⃣ Current flows through the armature

  3️⃣ Magnetic field interacts with the current

  4️⃣ Force is generated, causing rotation
• Permanent magnets in an electric motor create a magnetic field.
• What is the primary function of brushes in an electric motor?

  Maintain contact with commutator
• The motor effect converts electrical energy into mechanical energy.
• An electric motor and a generator operate on the same principle.

  False
• Match the device with its energy conversion:

  Electric Motor ↔️ Electrical to Mechanical

  Generator ↔️ Mechanical to Electrical
• What is the motor effect used for in an electric motor?

  Generating rotational force
• The motor effect occurs when a current-carrying wire in a magnetic field experiences a force
• What is the unit of magnetic field strength?

  Tesla
• What is the motor effect phenomenon?

  Current-carrying wire in magnetic field experiences force
• The force experienced in the motor effect is perpendicular to both the current direction and the magnetic field direction.
• Key factors influencing the force in the motor effect include current, magnetic field strength, and the length of the wire
• What is the formula for calculating the force in the motor effect?

  $F =$$BIL$
• The motor effect is the fundamental principle behind electric motors.
• Steps explaining how the motor effect works in an electric motor:

  1️⃣ Current is passed through the armature

  2️⃣ Armature is positioned in a magnetic field

  3️⃣ Current-carrying wires experience a force

  4️⃣ Armature rotates

  5️⃣ Commutator reverses current direction
• In an electric motor, the commutator reverses the current direction every half rotation
• Match the components of an electric motor with their function:

  Armature ↔️ Rotates due to force

  Stator magnets ↔️ Create magnetic field

  Commutator ↔️ Reverses current direction
• What are the units for magnetic field strength?

  Teslas (T)
• The force experienced by a current-carrying wire in a magnetic field is given by the equation $F =$$BIL$
• What is the unit for electrical current?

  Amperes (A)
• The motor effect is used in electric motors to convert electrical energy into mechanical energy.
• What is the formula for the force on a current-carrying wire in a magnetic field?

  $F =$$BIL$
• An electric motor converts electrical energy into rotational motion.
• Match the feature with the device:

  Converts electrical to mechanical ↔️ Electric Motor

  Converts mechanical to electrical ↔️ Generator
• Electric motors convert electrical energy into mechanical energy.
• Generators use the motor effect to produce electricity.

  False