Controls

Question 1

What are resistors?

Answer 1

• Resist current flow
• Measured in Ohms

Question 2

What are thermistors?

Answer 2

They change resistance when temperature changes

Question 3

What are inductors?

Answer 3

• Resist any change in current flow
  Stores energy in a magnetic field
• A coil of wire & metal core
• Inductance measured in henrys

Question 4

What are capacitors?

Answer 4

Store electrostatic energy

Question 5

What are Semiconductors?

Answer 5

• A mix of a conductor & insulator,it’s resistance fall as the temperature rises
• Measured in Siemens

Question 6

What are transistors?

Answer 6

Little switches made from silicone
It ensures the circuit is on if the current is flowing and switched off if it isn’t.

Question 7

What are thermocouples?

Answer 7

Detects temperature by generating voltage

Question 8

What do actuators do?

Answer 8

They correct & adjust the machinery to ensure its working correctly

Question 9

Open loop control

Types of control systems (how a system works & how it’s controlled)

Answer 9

• A system that needs outside feedback to make adjustments
  ie; a boiler on a timer will keep heating until the timer stops,regardless of the outside temp.

Question 10

Closed loop system

Types of control systems (how a system works & how it’s controlled)

Answer 10

• Monitors & sends feedback to itself.
  ie: a boiler with a termostat ,monitors room temp to maintain a specific temperature without outside input (turns itself off & on)