loudspeakers

• loudspeakers and headphones use the variations in alternating current to produce sound waves
• 1. as the current travels through the coil it experiences a force due to the magnetic field . this makes the speaker cone move
  2. because the current is alternating the direction of the force alternates and the speaker cone oscillates
• increasing the electrical power will produce a larger force so the cone will oscillate with a higher amplitude and produce louder sound waves
• the frequency of the sound produced mathes the freuquency of the alternating current
• the size of the speaker affects how quickly or slowly it can oscillate and how big they will be
• a larger cone is better for low pitched sounds and a small cone is better for high pitched sounds
• the motor effect is used in motors and speakr to convert electrical energy into kinetic and sound energy