Systems

Question 1

What is a system diagram?

Answer 1

Lays out the input, process and output stages of a system

Question 2

What does an input device do?

Answer 2

Receives an external signal

Question 3

What does the process device do?

Answer 3

Receives the important information and determines the output

Question 4

What are the different types of inputs?

Answer 4

• LDR
  detects changes in light levels
  Resistance increases in the dark and decreases in light
  Used in street lights + security lights
• Pressure Sensor
  detects changes in pressure in gases or liquid.
  used to detect a leak in a fuel system triggering a warning light if pressure fails
  -Switch
  turn a circuit on or off
  types include push, slide or toggle
  used in lighting, control panels and power switches
• Temperature Sensor
  Detects a change in temperature
  Temperature increase, resistance decreases
  used in household appliances and vehicles

Question 5

What are the different types of processes?

Answer 5

• Resistor
  used to limit the flow of current and helps to protect some components from being overload
• Microcontroller
• a programmable component is a chip which is used in electrical products such as washing machines