Loudspeakers and Microphones

What effect do headphones use to convert electrical signals into sound waves?

• Motor effect

• Generator effect

• Electromagnetic effect

• Acoustic effect

Fill in the blank: The _______ effect is used by microphones to convert sound waves into electrical signals.

• Motor

• Generator

• Electromagnetic

• Acoustic

Fill in the blank: The cone vibrations cause pressure variations in the air, which are _______.

• Electrical signals

• Sound waves

• Magnetic fields

• Elastic currents

Fill in the blank: The direction of the magnetic field _______ to make the cone vibrate in and out.

• A) Reverses

• B) Stays constant

• C) Increases

• D) Decreases

Fill in the blank: Microphones use the _______ effect to induce a changing current from sound waves.

• Motor

• Generator

• Electromagnetic

• Acoustic

What is the main function of a loudspeaker?

• To convert electrical signals into sound waves

• To amplify sound

• To create electrical signals

• To vibrate the coil.

What causes the flexible diaphragm in a moving-coil microphone to vibrate?

• A) Electrical signals

• B) Pressure variations in sound waves

• C) Magnetic fields

• D) Light waves

In a moving-coil microphone, the vibrations of the diaphragm cause vibrations in the ____.

• Magnet

• Coil

• Electrical leads

• Diaphragm support

What is induced in the coil when it moves relative to a permanent magnet in a moving-coil microphone?

• Current

• Potential difference

• Sound wave

• Light

The changing size and direction of the induced current in a moving-coil microphone matches the vibrations of the ____.

• Diaphragm

• Coil

• Magnet

• Electrical leads