Electronic Systems

Question 1

What are the 3 stages of a control system?

Answer 1

input.
process.
output

Question 2

Name examples of input sensors

Answer 2

LDR
Thermistor
switches

Question 3

Name examples of output devices

Answer 3

switches
buzzers
LEDs

Question 4

Name 4 types of processing device

Answer 4

microprocessor
computer
IC (integrated circuit)
semi conductor

Question 5

What is feedback?

Answer 5

feeding info from the output back into the input to achieve more precise control eg a thermostat in a central heating system

Question 6

What is a digital signal ?

Answer 6

either on or off (eg light or dark)

Question 7

What is an analogue signal?

Answer 7

can have any value between zero and max so can measure how big a physical quantity is (eg how bright)

Question 8

What is a programmable micro controller?

Answer 8

It is a process device used to count, switch or time.
The designer writes a program that is downloaded into the memory.
They can:
control a range of systems
can be reprogrammed lots of times

Question 9

What is a programmable interface controller (PIC)

Answer 9

used to control products and systems