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 produced in different ways; a Light-emitting diodes (LEDs) glow when current passes through them. is the most common component used for producing light.
- when A type of energy that comes in the form of positive and negative electrons and flows through conductive material like copper. passes through the A device that allows current to flow in one direction., the energy is released from the atoms and is seen as light, eg in camera phones as the flash
- LEDs only work in one direction
- the long leg is the positive (+) side, known as the Positively charged, the electrode where electricity flows into., and the short leg is the negative (-) side, known as the Negatively charged, the electrode where electricity flows out of.
Advantages
- LEDs come in a wide range of colours and sizes
- they are more energy efficient than other bulbs and have a longer life span
Disadvantages
- a resistor is placed in series with a LED to protect the LED from a high supply voltage - if the wrong value resistor is used, the LED may burn out or not light up at all
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
Loudspeakers
- 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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Motors
A machine that is powered by electricity or combustion that supplies motive power to a product with moving parts. convert power into rotary motion, moving gears or wheels by turning a A cylindrical-shaped piece of material. linked to them. They are used in wind turbines, cars and trains.
Question
Name a suitable output device for an MP3 amplifier system.
Speaker.
