1.4 - system approach when designing

Question 1

What is an output?

Answer 1

sends out information, heat, light, sound or mechanical movement to the environment the system is operating in

Question 2

What is a process?

Answer 2

How the product does it?

Question 3

What is an input?

Answer 3

electrical and mechanical sensors that use signals from the environment and convert them into signals that can be passed into processing devices and components

Question 4

What does a system diagram consist of?

Answer 4

input, process and output

Question 5

What is a system diagram?

Answer 5

a diagram that breaks down an operation into three main parts

Question 6

What does LDR stand for?

Answer 6

Light dependent resistor

Question 7

What is an LDR?

Answer 7

a component in which the resistance to the flow of an electrical current through it changes as the light intensity that falls upon it alters.
- input device

Question 8

What can LDRs be found in?

Answer 8

street lamps, clock radios, nightlights.

Question 9

What is a thermistor?

Answer 9

a component in which the resistance to the flow of an electrical current through it changes with temperature.

Question 10

What are the two types of thermistor?

Answer 10

Positive temperature coefficient - increases with temp increase
Negative temperature coefficient - decreases with temp increase

Question 11

What are thermistors found in?

Answer 11

toasters, coffee makers, refrigerators, freezers

Question 12

What are switches used for?

Answer 12

• turning something on
• object has reached as far as you want it to travel
• want to start something by pressing it with finger
• you want to know if something has closed
• you want to stop a machine if a guard is opened

Question 13

Describe a rocket switch?

Answer 13

flick either side

Question 14

What is a push to make switch?

Answer 14

push down on it

Question 15

What is a pressure pad switch?

Answer 15

apply pressure

Question 16

What s a process device?

Answer 16

handles information received and turn outputs on and or off

Question 17

What is a microcontroller?

Answer 17

a small computer within a single integrated circuit

Question 18

Where are microcontrollers found?

Answer 18

• car engine control system
• remote controls
• mechanical devices
• toys

Question 19

What does PIC chip stand for?

Answer 19

Peripheral interface controller

Question 20

What is a PIC chip?

Answer 20

common form of microcontroller that may be at a school

Question 21

What does a microcontroller circuit contain?

Answer 21

processor core, memory, programmable input and output compatibility.

Question 22

How are microcontrollers produced?

Answer 22

In mass by automated systems to reduce cost of individual ones

Question 23

How can microcontrollers be programmed?

Answer 23

using a range of languages such as BASIC or software that allows flowcharts

Question 24

give two examples of an output?

Answer 24

lamps and LEDs

Buzzers and Speakers

Question 25

Explain Lamps?

Answer 25

pass an electric current through a very thin filament usually made of tungsten. filament acts as an inert gas that is encased in glass bulb - give off considerable amounts of heads that’s why they are being replaced with LEDs

Question 26

What doe buzzers and speakers give out?

Answer 26

give out sound outputs.

Question 27

What are the two types of buzzer?

Answer 27

electromechanical and piezoelectric

Question 28

What are buzzers used in?

Answer 28

alarm devices, timers, mouse click

Question 29

What are loud speakers?

Answer 29

devices that convert electrical signals into a sound