Re: Question on batteries. Help!

December 30, 2008

Hi trev, to get 3 volts the series has to run positive to negative.

positive to positive and neg to neg will mean only 1.5 volts but more

battery life since you have two of them to supply the current for a

longer period until they both give out, but the voltage will not

exceend 1.5 volts that way.

bG

>

> I remember many years ago I took two flashlight batteries and wired

them so the plus sides were connected and the two negative sides also

connected after putting a a bulb in the circuit., in other words in

series and when conected to the flashlight bulb it lit up very

brightly. Because there were 3 volts instead of one and a half. I

recently tried this with two c batterys and the bulb did not light up

at all! The bulb lit up fine in the normal configuration but not

when the batteries were wired to give 3 volts. It did not work with two

used batteries and I got two new c batteries and it still did not

work. Can someone explain? I need 3 volts DC for two interesting

projects and I was using the bulb to test the circuit. But why does it

not light?. Trevor

>

December 30, 2008

Hi Bg, OK, I accept that. But why doesn't the bulb light up. I stripped the

ends of some insulated copper wire and taped it firmly to the flat ends of the

batteries and jammed the other ends of the batteries together into a wad of

aluminum foil so it seems to be a solid closed circuit. So why does it not

light?

> >

> > I remember many years ago I took two flashlight batteries and wired

> them so the plus sides were connected and the two negative sides also

> connected after putting a a bulb in the circuit., in other words in

> series and when conected to the flashlight bulb it lit up very

> brightly. Because there were 3 volts instead of one and a half. I

> recently tried this with two c batterys and the bulb did not light up

> at all! The bulb lit up fine in the normal configuration but not

> when the batteries were wired to give 3 volts. It did not work with two

> used batteries and I got two new c batteries and it still did not

> work. Can someone explain? I need 3 volts DC for two interesting

> projects and I was using the bulb to test the circuit. But why does it

> not light?. Trevor

> >

>

December 30, 2008

hm you said it lit very brightly before, could have burned out? does

the bulb work in any other situation, like inside a flashlight? a

meter could tell you if it's burned out or the filament is open

somewhere. If you are doing projects, in my experience a meter is a

very necessary tool. your time is worth something and meters are

about 12 bucks.

bG

> > >

> > > I remember many years ago I took two flashlight batteries and

wired

> > them so the plus sides were connected and the two negative sides

also

> > connected after putting a a bulb in the circuit., in other words

in

> > series and when conected to the flashlight bulb it lit up very

> > brightly. Because there were 3 volts instead of one and a half.

I

> > recently tried this with two c batterys and the bulb did not

light up

> > at all! The bulb lit up fine in the normal configuration but

not

> > when the batteries were wired to give 3 volts. It did not work

with two

> > used batteries and I got two new c batteries and it still did not

> > work. Can someone explain? I need 3 volts DC for two

interesting

> > projects and I was using the bulb to test the circuit. But why

does it

> > not light?. Trevor

> > >

> >

>

December 30, 2008

Lots of factors.

First, what you describe, pos to pos, neg to neg to pos is parallel,

not series connection. Series would be pos to neg to pos to neg to

bulb and back to pos.

using 2 batteries, you get:

Parallel is: pos-----pos-----|

batt batt Bulb

neg-----neg-----|

(this is 1.5vdc, but a higher amps than series connected)

Series is: pos-----batt-----neg-----|

| Bulb

neg-----batt-----pos-----|

(.this is 3.0vdc, but less amps than parallel connected)

(I hope this comes through as readable)

Now the bulb that you used, if it's a 3v bulb, then it will be bright

in series, but dim in Parallel. Bulbs for flashlights are available

in a lot of different voltage ratings. If they don't match the power

supply you get either a blown bulb or a dim bulb.

Dave

At 10:49 AM 12/30/2008, you wrote:

>I remember many years ago I took two flashlight batteries and wired

>them so the plus sides were connected and the two negative sides

>also connected after putting a a bulb in the circuit., in other

>words in series and when conected to the flashlight bulb it lit up

>very brightly. Because there were 3 volts instead of one and a half.

>I recently tried this with two c batterys and the bulb did not light

>up at all! The bulb lit up fine in the normal configuration but not

>when the batteries were wired to give 3 volts. It did not work with

>two used batteries and I got two new c batteries and it still did

>not work. Can someone explain? I need 3 volts DC for two interesting

>projects and I was using the bulb to test the circuit. But why does

>it not light?. Trevor

>

Bro. Dave, OBB and Maxx (ESS)

Green Bay Monastery

December 31, 2008

Yep, u got it correctly!