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Grade 6

Systems and control: an electrical shock

Module 15

Making a traffic regulator

To the Educator: This assignment can be executed as an individual or as a group project.

(a) What is the problem? You are a citizen of Muddle Town. The town traffic is always chaotic because drivers do not stop their vehicles at the main street crossing. Everyone is permanently late for work because of the frequent accidents and regular congestion of traffic at this important street intersection.

(b) What is required? A “machine” that will regulate the traffic in a reasonable way from day to day.

  1. What is your brief? You are asked to design and build a prototype machine that can be erected at the street intersection to regulate the traffic.

(d) What limitations are placed on your prototype? You may use: 3 light bulbs of different colours (LED’s) as resistors; a battery as energy source and a container for the battery; lengths of copper wire with clamps as conductors; a wooden board; 4 drawing pins; and a paper clip as the switch.

Only one light may glow at any particular time. The lights must indicate to motorists that vehicles in one traffic lane have to stop while vehicles in another lane may continue travelling. One of these machines will be erected on each of the corners at the intersection, but you need to build only one.

You may present the machine in any form, but it may not be higher than 30 cm and wider than 20 cm. It must be solid, stable and strong.

Assignment 1

[lo 1.2]


Consult different sources and suggest at least three solutions for this problem. Draw sketches of these solutions or write notes about the possibilities that you are suggesting.

Assignment 2

[lo 1.5]


  1. Make free-hand drawings of three circuits that could provide solutions to the traffic problem. Also provide labels.

Your final choice

Draw the circuit diagram of your final choice.

[LO 1.6]


  • Must the lights be connected in serial or in parallel if they need to work one at a time?
  • What must be shifted to a different position so that only one light will light up at a time?
  • Design a stand on which the lights, switch and battery can be mounted for the machine to work. This machine will eventually be controlled automatically, but someone will have to be employed to operate the changing of the lights, in the mean time. Discuss the requirements for such a stand with the members of your group. Indicate the dimensions so that it will be possible for other people to understand your ideas and how the machine works.

[LO 1.5]

Develop your best idea fully.

Assignment 3

[lo 1.9]


  1. Build the stand for the circuit. What materials will you be using?
  2. Which tools will you be using?
  3. Which action will you be taking – give a step by step explanation of what you will do:

[LO 1.8]

  1. Mount the circuit on the stand.
  2. Demonstrate your invention to the rest of the class and explain how it works.
  3. Provide a suitable name for your invention.
  4. Write a step-by-step description of how you made your invention.

[LO 1.7]

Assignment 4

[lo 1.10]


Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Technology grade 6. OpenStax CNX. Sep 08, 2009 Download for free at http://cnx.org/content/col11005/1.1
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