SystemsEighth Grade Technology

Mr. Ruddle

What is a system?

A system is a group of interrelated parts that work

together to accomplish a goal.

What does “interrelate” mean?

What is a system?

When things interrelate, it means that they make connections with multiple

things.

Usually, in a system, the interrelated parts depend on each other.

What does “interrelate” mean?

Open-Loop Systems

Closed-Loop Systems

There are two types of systems

Open-Loop Systems continuously interact with the environment or humans. Usually, an open-loop system does some function, then stops until it receives a command again.

Closed-Loop Systems operate and self-regulate without interaction with the humans except for initial input. Usually, a person enters an initial setting and the system completes the same operation until an new setting is entered.

What’s the difference?

Open-Looped◦ Computer◦ Washing Machine◦ Dish Washer

Closed-Looped◦ Air Conditioner◦ Hot Water Heater

What are some examples?

Universal Systems Model

Inputs

Feedback

Processes OutputsGoal

CRITERIA

MaterialTools/Machines

EnergyMoney

KnowledgePeopleTime

Actions Results

Purpose

Expectations

New KnowledgeControls / Sensors

System Interrelate

Open-Loop System Closed-Loop System

Goal Criteria Inputs

Processes Outputs

Feedback

Vocabulary