Electric motors and loudspeakers

What is the role of the motor effect in electric motors?

The motor effect causes the coil in a motor to spin when current flows through it in a magnetic field.

How is continuous rotation achieved in an electric motor?

Continuous rotation is achieved using a split-ring commutator, which reverses the current every half-turn.

What is the function of brushes in an electric motor?

Brushes maintain electrical contact between the commutator and the power supply.

What is a split-ring commutator?

A device that reverses the direction of current in the coil every half-turn to ensure continuous rotation.

How does the strength of the magnetic field affect a motor?

A stronger magnetic field increases the torque and speed of the motor.

What is the purpose of loudspeakers?

Loudspeakers convert electrical energy into sound energy.

How do loudspeakers use the motor effect?

In loudspeakers, a coil carrying an alternating current interacts with a magnetic field, causing a cone to vibrate and produce sound waves.

What determines the pitch of sound in a loudspeaker?

The frequency of the alternating current determines the pitch of the sound.

What determines the loudness of sound in a loudspeaker?

The amplitude of the alternating current determines the loudness of the sound.

How does reversing the current in a loudspeaker coil affect the cone?

Reversing the current changes the direction of the force, moving the cone in the opposite direction.

Why is alternating current used in loudspeakers?

Alternating current allows the cone to vibrate back and forth, producing sound waves.

What materials are typically used for the cone in a loudspeaker?

Cones are often made of lightweight materials such as paper or plastic to respond quickly to vibrations.

How does the magnetic field in a loudspeaker affect sound production?

A stronger magnetic field results in a greater force, causing more pronounced vibrations and louder sounds.

What is the role of the permanent magnet in a loudspeaker?

The permanent magnet provides a constant magnetic field that interacts with the coil's current to produce motion.

How can the sound output of a loudspeaker be increased?

Increasing the current or using a stronger magnetic field can increase the sound output.