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In this problem-based learning activity, you will experiment with a battery and light bulbs to build your own flashlights. The purpose of the activity is to develop understanding of fundamental electrical circuit concepts, including voltage, current, and closed circuits, and to help eliminate common misconceptions.
Development of this material was supported by the Arizona Board of Regents' Learner Centered Education Grant Program, Grant #11BU06.
Instructor information for this module is available here .

Introduction

The objective of this problem based learning activity is to create several simple electrical circuits with light bulbs and a battery. The purpose of the activity is to introduce you to several fundamental concepts in electrical circuits and identify and correct some potential misconceptions that you may have about electrical circuits.

Lighting one bulb

Suppose you are driving late at night along a dark road and your car suddenly stops. Hoping to figure out what is wrong with the engine, you grab your flashlight and step out of the car, but accidentally drop the flashlight on the the pavement where it breaks into several pieces. You retrieve a battery and a light bulb from the black top. You have a few wires in the glove box leftover from your attempt to install a stereo. Can you use the battery, light bulbs, and wires to create enough light to check your engine?

Preliminary reading

Before beginning the activity, read this description of a light bulb . Pay particular attention to the figure of the light bulb-how is the filament connected to the two contacts?

Additional reading resources

The following resources give additional information about circuits, and you may find them useful and interesting either before or after the problem based learning activity.

Preliminary questions

Before beginning the activity, answer the following questions:

  • On , mark the path that electricity takes through the light bulb.
  • Sketch how you could connect a wire, battery, and bulb to light the bulb.
Discuss your answers with your team.

Cutaway drawing of a lightbulb.

Activity

Working in your team, connect the battery and light bulb using wires so that the light bulb is lit. Once you create a working circuit, try disconnecting each wire in your circuit (and then reconnecting it); what happens?

Post-activity questions

  • Sketch your working circuit-how is it different from your initial sketch? Why is it different?
  • What path does electricity take through the light bulb?
  • What path does electricity take through your working circuit?
  • An electrical schematic is a symbolic representation of a circuit. shows schematic symbols for a battery and a light bulb; lines between the symbols represent wires. Drawn a schematic that represents your working circuit.
Schematic symbols for a battery and a light bulb.

Lighting two bulbs

After you successfully light up the bulb, you discover that it is too small to illuminate the engine compartment. You remember that your flashlight had a spare bulb; you eventually locate it and try to create a circuit that generates twice as much light.

Preliminary question

Before beginning this portion of the activity, complete the following preliminary question:

  • Sketch how you will connect wires, the battery, and both bulbs so they both light and provide more light than a single bulb.
Discuss your sketch with your team.

Activity

Working in your team, find two different configurations in which the battery, wires, and lights are connected so that both bulbs light. For each configuration,

  • Draw a schematic diagram.
  • Note the brightness of both light bulbs.
  • Measure and record the voltage across the battery terminals.
  • Measure and record the voltage across the two lightbulbs.

Post-activity questions

  • Which configuration provides the larger amount of light? Can you relate this to the voltage across the light bulbs?

Questions & Answers

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 ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
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.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
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
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
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
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
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
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
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Smarajit Reply
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Source:  OpenStax, Circuits. OpenStax CNX. Oct 12, 2008 Download for free at http://cnx.org/content/col10589/1.1
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