Outputs
A device used to output data or information from a computer, eg a monitor, printer or speakers. allow a system to present information back into the ‘real’ world. Examples can be seen everywhere, from car indicators to doorbell buzzers or information displays.
Purpose of output devices
Light outputs
Light can be created using Used on control panels as an indicator or to provide illumination.:
- when Moving electric charges, eg electrons moving through a metal wire. flows through the A thin wire, usually found in an electric lamp. it heats up and light is produced
- filament lamps are increasingly being replaced with energy-saving alternatives, such as Light-emitting diodes (LEDs) glow when current passes through them.
Lamp - Used on control panels as an indicator or to provide illumination
Sound outputs
Sound can be produced using An output device that produces a buzzing sound when current flows through it. or An output device that produces sound using electromagnetism..
Buzzers
- buzzers have an An electronic device used to generate a signal. inside a plastic case
- when current flows through them they produce a buzzing sound, often around 400 Hertz (Hz) in The number of waves produced each second. The unit of frequency is hertz (Hz). depending on the type of buzzer used
- examples of their use include in doorbells and alarms
Speakers
- speakers produce sound using A magnet made by wrapping a coil of wire around an iron bar and passing an electric current through the coil.
- they usually require a An electronic circuit that presents an amplified signal to a loudspeaker with enough energy to generate audible sounds. to provide a signal that they can use, such as an audio An electronic device that magnifies the signal that is fed into it by a certain amount, eg volume controls are amplifiers.
- the correct speaker The opposition in an electrical component to the movement of electrical charge through it. Resistance is measured in ohms. value must always be used to prevent damage to the driver circuit
Image caption, Buzzer - Used to generate a warning sound
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Question
Name a suitable output device for an MP3 amplifier system.
Speaker.
