Loudspeakers and the Motor Effect: Converting Electric Currents into Sound Waves

The video tutorial explains how loudspeakers use the motor effect to convert electric currents into sound waves. It begins by describing the motor effect, where a current-carrying conductor experiences a force in a magnetic field. Using Fleming's left-hand rule, the direction of this force is determined. The tutorial then illustrates how loudspeakers apply this effect: a conducting coil with alternating current vibrates within a magnetic field, causing a diaphragm to move and generate sound waves. The frequency of these sound waves matches the alternating current's frequency.

What is the motor effect?

• A force experienced by a conductor in a magnetic field

• The conversion of sound waves into electric currents

• The process of generating electricity using magnets

• A method to increase the speed of electric currents

How can you determine the direction of the force on a conductor in a magnetic field?

• Using the right-hand rule

• Using Fleming's left-hand rule

• By measuring the current

• By observing the magnetic field lines

What role does the conducting coil play in a loudspeaker?

• It converts sound waves into electric currents

• It vibrates to produce sound waves

• It generates the magnetic field

• It amplifies the sound

Why does the conducting coil in a loudspeaker vibrate?

• Due to the constant magnetic field

• Because of the alternating current

• To increase the volume of sound

• To stabilize the electric current

What determines the frequency of the sound waves produced by a loudspeaker?

• The frequency of the alternating current

• The strength of the magnetic field

• The size of the diaphragm

• The length of the conducting coil