Date: Wed, 26 Feb 2003 12:02:49 -0500

Author: Gerald Zani

Subject: Re: Tips and Suggestions

Post:

Speaking of basic electronics tips for labs and demos,

Tip: how to use a diode, such as an LED. Put a resistor in series with a
diode to limit the current when connecting a diode directly to a DC power
supply. A typical resistor range is 100 to 1K Ohm.

Tip: how to wire a reversing switch that when thrown will reverse the
direction of the current. Show schematic to wire a reversing switch using a
DPDT knife switch.

Jerry

At 11:08 AM 2/26/2003 -0500, you wrote:
>One topic we've had much interest in from the high school teachers who
>take our summer courses is basic electronic circuits. We've thought
>about offering a quick course which would include topics from how to
>solder to providing them with a set of useful circuits like how to make
>a switch from a transistor or scr, how to trigger a strobe using sound
>or light, simple photogate circuits and so forth.
>
>Mike Timmins
>
>On Wed, 2003-02-26 at 09:47, Machele Cable wrote:
> > I'm still looking for tips and suggestions that would be useful to the
> > average Physics Teacher (haven't recieved ANY!). This is for the
> > resource CD I'm making. Thanks!
> >
> > Chele
>--
>Mike Timmins
>Department of Physics
>382 McCormick Rd
>University of Virginia
>Charlottesville, VA 22904-4714
>Voice: (434)924-6800
>e-mail:mat3q@virginia.edu

Gerald Zani e-mail: Gerald_Zani@brown.edu
Manager of Demonstrations phone: (401) 863-3964
Department of Physics FAX: (401) 863-2024
Brown University Providence, RI 02912-1843 USA

URL http://www.physics.brown.edu/users/staff/zani/index.html
URL http://www.physics.brown.edu/Studies/Demo/

Do a little more of that work which you have confessed to be good,
Which you feel that society and your most Just Judge rightly demand of you.
Cultivate the tree which you have found to bear fruit in your soil.
If you have any experiments you would like to try, try them.
Now's your chance.
Henry David Thoreau, Journal entry, 1850.
From grahamaj@appstate.edu Wed Feb 26 12:12:34 2003
Date: Wed, 26 Feb 2003 12:12:43 -0500
From: Andy Graham
Subject: Re: Searchable DCS
To: tap-l@listproc.appstate.edu
Message-id: <3E5CF58C.BA38C272@appstate.edu>
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Hi Machele,

Try

http://www.Newton.appstate.edu:591

I've just set it up temporarily, so you can try it. Select PIRA DCS Converted. Select
Table view. The format isn't very pretty, but I will fix it with time. It is
searchable. Please don't edit. In an updated version I'll have it locked so it can't
be edited.

andy

Machele Cable wrote:

> Is there anyone who has a searchble DCS on their website? The one at
> NCSU doesn't seem to be up and running any more. Bummer.
>
> Chele
>
> --
> ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
> Machele Cable Lab Manager Physics WFU
> Phone: (336) 758-5532 Fax: (336) 758-6142
> ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
> Friends are the Bacon Bits in the salad bowl of life.
> ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
> There's a thin woman inside of me trying to get out,
> but I can usually shut her up with some chocolate!
From cbettis@unlserve.unl.edu Wed Feb 26 12:23:48 2003
Message-ID: <004c01c2ddbc$14380140$2c245d81@unl.edu>
From: "Cliff Bettis"
To:
References:
Subject: Re: Tips and Suggestions (fwd)
Date: Wed, 26 Feb 2003 11:25:35 -0600
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Dick,

Excellent! I posted your comments on my bulletin board for all to see.

Cliff
----- Original Message -----
From: "Richard Berg"
To:
Sent: Wednesday, February 26, 2003 10:53 AM
Subject: Re: Tips and Suggestions (fwd)


> I would like to make a couple of comments regarding quality use of
> demonstrations.
>
> As some of you know, research in physics education has come into its own
> as a generally recognized area of physics research in the past ten years,
> and several major universities as well as a number of smaller colleges
> are now involved in this venture.
>
> One of the interesting things that they have discovered regards how to use
> demonstrations in the most effective manner. I thnk that summarizing an
> effective technique would be as follows:
>
> 1. Show the demonstration to the class and let them see what it would do
> if it were operated.
>
> 2. Propose an experiment, and describe, or let the class come up with the
> various possible results. This might even be done by allowing them to
> think about it from one class meeting to the next.
>
> 3. Let the class members vote on what they think the outcome of the
> experiment might be. This is a nice place to use the PRS devices that
> have become popular as of late. A cheap alternative is lettered or
> numbered cards that the students can hold up.
>
> 4. Then let them discuss the question among themselves to see if their
> individual logic can stand up to the scrutiny of others.
>
> 5. Have another vote, to see how many of the students were able to change
> each others' convictions.
>
> 6. Perform the experiment, so that every individual can see how his or her
> ideas conform with actual experimental results.
>
> 7. Discuss the experiment further so that each student is forced to
> confront the errors in his or her physical concepts - and to ultimately
> adjust their thinking to conform to reality.
>
> It turns out that using this general procedure has several very
> interesting results. The students actually seem to learn more physics
> and it appears to stay with them longer and mean more. They remember the
> experimental results of the demonstration properly. When they are simply
> shown the demonstrations in the process of a lecture, about one year
> later many students actually remember incorrect results, even though they
> actually saw the demonstration properly performed in class.
>
> If you would like to see some of the type of questions that the professors
> ask here, see our Question of the Week web site:
>
> http://www.physics.umd.edu/lecdem/outreach/QOTW/active/questions.htm
>
> An excellent reference is the book "Peer Instruction" by Eric Mazur.
>
> For those of us involved in preparing demonstrations for teachers, this is
> an excellent opportunity to use our materials to really help the teaching
> and learning process.
>
> Best wishes,
>
> Dick Berg
>
> ***********************************************************************
> Dr. Richard E. Berg, Director Phone: (301) 405-5994
> Lecture-Demonstration Facility FAX: (301) 314-9525
> Department of Physics e-mail reberg@physics.umd.edu
> University of Maryland www.physics.umd.edu/lecdem
> College Park, MD 20742-4111
> ***********************************************************************
From MKossover@newmanschool.org Wed Feb 26 12:34:24 2003
Message-ID: <3BB802873F45D51197CB006008F6E546DBCB1E@mail.newmanschool.org>
From: Kossom
To: "'tap-l@listproc.appstate.edu'"
Subject: RE: Tips and Suggestions
Date: Wed, 26 Feb 2003 11:30:55 -0600
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Howdy-

> From: Andy Graham [mailto:grahamaj@appstate.edu]
> Sent: Wednesday, February 26, 2003 9:04 AM
> 1. If you want to check to see if a battery is dead, measure the current
> output, don't
> measure the voltage. Battery can maintain the potential difference
> between the poles
> after their ability to actually deliver a significant current has passed.

I use this all the time with small batteries and a 10 Amp multimeter.

However, my class is building a BattleBot which uses two motorcycle
batteries. We are not sure how to determine how much capacity the batteries
have left. Can't really use the above with batteries that can deliver 500 A.


Also, when we use a battery charger, how do we know when the batteries are
charged? Are they charged when an ammeter measures a significant reduction
in current at the charging voltage?

Marc "Zeke" Kossover
From reberg@physics.umd.edu Wed Feb 26 12:37:23 2003
X-Authentication-Warning: student1.physics.umd.edu: reberg owned process doing -bs
Date: Wed, 26 Feb 2003 12:39:09 -0500 (EST)
From: Richard Berg
To: tap-l@listproc.appstate.edu
Subject: Re: search engine (fwd)
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Ladies and Gentlemen,

In response to my inquiry, a copy of which I posted to the tap-l list this
morning (and is reprinted below), I received the following from Kevin
Dudley, the new demo guy at NCSU.

Dick Berg

***********************************************************************
Dr. Richard E. Berg, Director Phone: (301) 405-5994
Lecture-Demonstration Facility FAX: (301) 314-9525
Department of Physics e-mail reberg@physics.umd.edu
University of Maryland www.physics.umd.edu/lecdem
College Park, MD 20742-4111
***********************************************************************

---------- Forwarded message ----------
Date: Wed, 26 Feb 2003 12:30:24 -0500
From: Kevin M. Dudley
To: Richard Berg
Subject: Re: search engine

Hi Dick,

My name is Kevin Dudley, and I'm the new director of demonstrations here at
NCSU. I took the position last January.

The demoserver has had some trouble as of late. Last summer is was hacked
into and since then, it has been up and down a number of times. It was
switched over to a campus run server (instead of the local server of the
past) towards the end of last year. For the last 3 months of last year I
was having troubles with a severely pinched nerve bundle that resulted in
surgery that kept me out of commission from 11/06 until the beginning of
this year. Now that that's out of the way....

I'm trying to learn some of the necessary languages and such that are
needed to work on the server. Unfortunately, I'm not a savvy as Keith was
about this type of thing and the campus computing folks only supply the
hardware and not the content. However, finding out that the other search
portions of the server are not working, leads me to believe that this might
be a problem that the IT folks are going to have to address.

It is my intention to have the server and all of its functions working. So
I will get on the IT folks and see what can be done. I will let you know
if I will not be able to get everything running again so that other
arrangements for the physics demonstration community can be made.

Thanks for bringing this to my attention!

-Kevin

================================================
Kevin M. Dudley -*- Director of Demonstrations
NC State University -*- Department of Physics
mailto:kevin_dudley@ncsu.edu -*- Phone: 515-2910
================================================


--On Wednesday, February 26, 2003 12:01 -0500 Richard Berg
wrote:

r>
r> To the director of demonstrations at NCSU:
r>
r> I am not sure whom to address there at NCSU, so I will do it this way.
r>
r> For a long time there was a search engine that searched many physics
r> demonstration web sites, at your address:
r>
r> http://demoroom.physics.ncsu.edu/resources.html
r>
r> This was developed and maintained by Keith Warren.
r>
r> It does not seem to be working now.
r>
r> Do you have any intention of getting this setup back? I, and apparently
r> a large number of other demonstration people have used it in the past and
r> found it to be very helpful.
r>
r> If you do not intend to restore this arrangement, would you mind if
r> someone else copied the program and moved it to another server?
r>
r> Thank you.
r>
r> Dick Berg

--End of message from Richard Berg --

From dodds@rice.edu Wed Feb 26 13:01:34 2003
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Date: Wed, 26 Feb 2003 12:07:05 -0600 (CST)
From: Stanley A Dodds
To: "'tap-l@listproc.appstate.edu'"
Subject: RE: Tips and Suggestions
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A couple of points here.

I think Andy meant to check that the battery can drive current through
an appropriate load, not a low-resistance meter. Typically that would
mean picking a power resistor that would discharge the battery in
about 10 hours. If it can drive that amount of current, it's OK. A
failed battery will have high internal resistance, and won't be able
to do that.

For charging, you want to push enough current to fully charge in a few
hours. Lead-acid batteries are usually specified by amp-hour capacity,
so that is easy to estimate. Charging much faster risks overheating.

I don't know how official battery chargers work, but with a variable
supply you can set the voltage to get the desired current, and then
increase the supply voltage intermittently as the terminal voltage
rises (current drops off also) with charging. Stop when you get to the
final terminal voltage, which may be over the 'rating'. For example, a
fully charged 12V car battery actually reads about 14V. This is
probably a conservative approach, but it should be fairly safe for all
concerned.

Stan

On Wed, 26 Feb 2003, Kossom wrote:

> Howdy-
>
> > From: Andy Graham [mailto:grahamaj@appstate.edu]
> > Sent: Wednesday, February 26, 2003 9:04 AM
> > 1. If you want to check to see if a battery is dead, measure the current
> > output, don't
> > measure the voltage. Battery can maintain the potential difference
> > between the poles
> > after their ability to actually deliver a significant current has passed.
>
> I use this all the time with small batteries and a 10 Amp multimeter.
>
> However, my class is building a BattleBot which uses two motorcycle
> batteries. We are not sure how to determine how much capacity the batteries
> have left. Can't really use the above with batteries that can deliver 500 A.
>
>
> Also, when we use a battery charger, how do we know when the batteries are
> charged? Are they charged when an ammeter measures a significant reduction
> in current at the charging voltage?
>
> Marc "Zeke" Kossover
>
>
From andersos@SONOMA.EDU Wed Feb 26 13:28:13 2003
Date: Wed, 26 Feb 2003 10:30:26 -0800
From: Steve Anderson
Subject: Re: Tips and Suggestions (fwd)
To: tap-l
Reply-to: Steve Anderson
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Reply to: Re: Tips and Suggestions (fwd)

Richard Berg wrote:
>I would like to make a couple of comments regarding quality use of
>demonstrations.
>snip<
Excellent! very insightful.
Richard describes the ideal way to use a demo and an "interactive" lecture.
Being involved and challenged, forming and supporting a point of view, predict,
experiment, reach a conclusion, feedback to premise and report, science in action!

steve anderson
CSU Sonoma
From cablem@wfu.edu Wed Feb 26 13:29:35 2003
Message-ID: <3E5D07FB.1020007@wfu.edu>
Date: Wed, 26 Feb 2003 13:31:23 -0500
From: Machele Cable
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To: tap-l@listproc.appstate.edu
Subject: Re: Searchable DCS
References: <3E5CEC58.3020701@wfu.edu> <3E5CF124.6C162A86@physics.syr.edu>
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No. I don't have a searchable DCS. The PIRA site was linked to the page
at NCSU. What PIRA has are files that can be downloaded.

Chele

Sam Sampere wrote:

>I thought it was up and running at your site. Am I wrong?
>
>Sam
>
>Machele Cable wrote:
>
>
>
>>Is there anyone who has a searchble DCS on their website? The one at
>>NCSU doesn't seem to be up and running any more. Bummer.
>>
>>Chele
>>
>>--
>>~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
>> Machele Cable Lab Manager Physics WFU
>> Phone: (336) 758-5532 Fax: (336) 758-6142
>>~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
>> Friends are the Bacon Bits in the salad bowl of life.
>>~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
>> There's a thin woman inside of me trying to get out,
>> but I can usually shut her up with some chocolate!
>>
>>
>
>
>
>
>

--
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
Machele Cable Lab Manager Physics WFU
Phone: (336) 758-5532 Fax: (336) 758-6142
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
Friends are the Bacon Bits in the salad bowl of life.
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
There's a thin woman inside of me trying to get out,
but I can usually shut her up with some chocolate!


From cablem@wfu.edu Wed Feb 26 13:34:12 2003
Message-ID: <3E5D0911.3060101@wfu.edu>
Date: Wed, 26 Feb 2003 13:36:01 -0500
From: Machele Cable
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.2) Gecko/20021216
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: tap-l@listproc.appstate.edu
Subject: Re: Searchable DCS
References: <3E5CEC58.3020701@wfu.edu> <3E5CF58C.BA38C272@appstate.edu>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
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I should have specified that I was looking for a site to link to from
the PIRA page, not a site to look through myself. Sorry! I wouldn't want
to link to a file that 100 people might corrupt and ruin your hard work!

Chele

Andy Graham wrote:

>Hi Machele,
>
>Try
>
>http://www.Newton.appstate.edu:591
>
>I've just set it up temporarily, so you can try it. Select PIRA DCS Converted. Select
>Table view. The format isn't very pretty, but I will fix it with time. It is
>searchable. Please don't edit. In an updated version I'll have it locked so it can't
>be edited.
>
>andy
>
>Machele Cable wrote:
>
>
>
>>Is there anyone who has a searchble DCS on their website? The one at
>>NCSU doesn't seem to be up and running any more. Bummer.
>>
>>Chele
>>
>>--
>>~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
>> Machele Cable Lab Manager Physics WFU
>> Phone: (336) 758-5532 Fax: (336) 758-6142
>>~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
>> Friends are the Bacon Bits in the salad bowl of life.
>>~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
>> There's a thin woman inside of me trying to get out,
>> but I can usually shut her up with some chocolate!
>>
>>
>
>
>
>
>

--
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
Machele Cable Lab Manager Physics WFU
Phone: (336) 758-5532 Fax: (336) 758-6142
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
Friends are the Bacon Bits in the salad bowl of life.
~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~ - ~
There's a thin woman inside of me trying to get out,
but I can usually shut her up with some chocolate!


From Gerald_Zani@brown.edu Wed Feb 26 13:38:11 2003

Back