Hardware used for input and output

Question 1

Name 3 elements that the hardware device needs to operate.

Answer 1

A method for the CPU to communicate with the device, software to instruct and control the device and electricity to power the device

Question 2

Explain the method for the CPU to communicate with the device.

Answer 2

The device must send data to and/or receive data from the CPU. The CPU might need to control the device by passing instructions to it, and/or the device might need to request service from the CPU.

Question 3

Explain the software to instruct and control the device.

Answer 3

A device is useless without software to control it. The software must know how to communicate with the device at the detailed level of that specific device, and the CPU must have access
17
to this software to interact with the device. Each device responds to a specific set of instructions based on the device’s functions. The software must have an instruction for each possible action you expect the device to accomplish

Question 4

Explain electricity to power the device.

Answer 4

Electronic devices need electricity to operate. Devices can receive power from the power supply inside the computer case, or they can have their own power supplied by a power cable connected to an electrical outlet.