Speaker:Speaker:

A device that converts A device that converts electrical signals into soundelectrical signals into sound

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What is electricity?What is electricity? A form of energyA form of energy Non-static electricity is the movement Non-static electricity is the movement

of electrons, usually in a wireof electrons, usually in a wire

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What is a sound wave?What is a sound wave?

A pressure wave traveling in a mediumA pressure wave traveling in a medium

Air molecules get compressed and as the Air molecules get compressed and as the air molecules spread out, they in turn air molecules spread out, they in turn compress the adjacent air causing the compress the adjacent air causing the sound wave to continue.sound wave to continue.

Electricity creates a magnetic Electricity creates a magnetic fieldfield

Current is the flow of ElectronsI = electrons/time

A changing magnetic field A changing magnetic field creates electricity in a wirecreates electricity in a wire

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Electricity and Magnetism are Electricity and Magnetism are relatedrelated

A moving/changing magnetic field A moving/changing magnetic field can produce current.can produce current.

Moving electrical charge (current) Moving electrical charge (current) can produce a magnetic field.can produce a magnetic field.

How does sound vibration get How does sound vibration get converted into electrical converted into electrical

signals?signals?

Electrical current corresponds to the pattern of the sound wave.

Sound vibrates diaphragm, which moves coil

This device is commonly called the Microphone

How do electrical signals get How do electrical signals get converted back into a sound converted back into a sound

wave?wave?

This device is commonly called a Speaker

When an electrical signal from an amplifier is sent to the voice coil, a magnetic field is set up around the coil. The permanent magnet in the speaker will push and pull on the coil in a way that matches the incoming electrical signal.

The coil is attached to the speaker’s cone. As the cone moves and vibrates, a sound wave is created. www.speakers.net/images

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