Input devices IGCSE

what is input device ?

• Computer does not need an input device

• Input device is not important

• Input device is any device that provides data/information to the computer

• It a device that displays data

what are the most commonly used input devices?

• Scanner and printer

• Keyboard and Speaker

• Mouse and Keyboard

• Monitor and Scanner

What is the device shown in the picture ?

 

• Webcam

• PRINTER

• Scanner

• Projector

How does a microphone work ? Explain with steps

Answer explanation

1. When sound is created, it causes the air to vibrate.

2. When a diaphragm in the microphone picks up the air vibrations, the diaphragm also begins to vibrate.

3. A copper coil is wrapped around the cone which is connected to the diaphragm. As the diaphragm vibrates, the cone moves in and out causing the copper coil to move backwards and forwards.

 4. This forwards and backwards motion causes the coil to cut through the magnetic field around the permanent magnet, inducing an electric current.

5. The electric current is then either amplified or sent to a recording device.The electric current is analogue in nature.

Benefits of an optical mouse over a mechanical mouse

Answer explanation

1. There are no moving parts, therefore it is more reliable.

2. Dirt can’t get trapped in any of the mechanical components.

3. There is no need to have any special surfaces.