# Making a "Dummyloop" a Dummy AA Battery, easy mod

For the record I was not the one who asked the resistance.

Resistance is Futile!
:bigsmile:

It's all my fault. :'( Please forgive me. I didn't tell him to do it I'm just the enabler. :p

I appreciate you deleting all of your posts. :p So is this one going to be disappeared next? ;)

i am confused now..

I'm not sure about other people but to me this is not a silly post. We were just discussing whether it is needed to measure the resistance of wire. Which you suggested I might add.

Old Lumens - Some info for you or whoever is interested.

Your hole size: 5/32 inch hole = 0.1563 inch.

8 gauge solid copper = 0.1285 inch
7 gauge solid copper = 0.1443 inch - resistance per 1000 ft = 0.4982 ohms/ 0.0004982 ohms per foot/ 0.000041516666 ohms per inch

6 gauge solid copper = 0.162 inch - resistance per 1000 ft. = 0.3951 ohms/ 0.0003951 ohms per foot/ 0.0000329525 ohms per inch

Your call on what size wire you got. I don’t know exactly what length wire you used but you should be able to do the math from here.

I must have read the wrong column in the chart. Well whatever gauge it is, it’s heavy enough to offer low resistance, I would think.
I never measured the wire size. It was a short length hanging on the wall and labeled as ground wire. I bought it because the guy at Lowes gave it to me for a buck and there’s about 5’ there.

Assuming the wire was perfectly straight (probably not - very hard to do) 8 and 7 gauge would fit a 5/32 inch hole just fine. 6 gauge would not fit at all and 10 gauge would be a little sloppy in there.

HKJ is darn close on his estimate!

What’s the mAh rating? 8)

Your contact resistance would be far higher the the resistance of the dummy battery itself.

Infinite mAh, 0.0V, 0.0 watt-hours

This is for a two phase 240v feed. Keep in mind that the electrical code only allows the conductor to be loaded to 80% for loads classed as continuous. The amp rating of a #6 R90 copper wire is 65 amps x 80% = 52 amps for a continuous load, and 65 amps for a noncontinuous load. See 2005 NEC 215.2(A)(1) including the exception.

The meter reads 000.3 with the two leads touching each other and 000.3 when checking the dummy battery. So… it’s a cheap meter and it’s not capable and the dummy must have very little resistance in it.

Oh well, not everyone has the equipment to check stuff, so we just continue on blindly and in ignorant bliss.

Very few meters can measure a resistance that low, even a expensive meter like this:

has problems.

The solution is either use a "trick" (See my DMM guide on how to measure low ohms, but you have to use higher current and a lower value reference resistor) or calculate the resistance.

Personally I prefer the calculation, it easy (I uses this program) and the precision is adequately.

LOL, not everyone has a good \$7 meter! My Harbor Freight DMMs were free, the bestest?/newest reads 0.6 as the “zero”.

Like the all copper no solder base idea.

Probably way more resistance in the contact points at the ends anyway but it is fun watching the merry go round. Higher spring pressure and improved mating of the contact points might help more than solid Cu vs solder and would improve both. By the way, nice clean work. As always.

My use for a “AA dymmy”:
Have an old radio with 8 `D´batteries,that is 12V.
If I want to try that with rechargeable AAs,the voltage will
be a bit low and it goes down after a day.
Will try one of those AA-to-D converter with three batteries,
to rise the voltage to better suite the radio.