Tagged Questions
-6
votes
2answers
150 views
Battery with most mAh that outputs between 1 and 1.5v? [closed]
I am looking for a rechargeable battery between 1 and 1.5 volts that can provide this voltage for the longest amount of time (most mAh). Any suggestions? Thanks.
6
votes
1answer
211 views
Why do batteries not last as long in a cold environment?
I know that batteries don't lase as long when they are used in a cold environment, but why is that?
For normal conductors resistance decreases as temperature goes down, so shouldn't the internal ...
1
vote
2answers
2k views
Connecting LEDs to a 9V battery
1) I have 6 4.5V 20mA LEDs and have connected them to a common 9V battery. Doing this I made 3 parallel circuits with 2 LEDs in each.
Now, I see that most pages that describe LED circuitry say that ...
4
votes
1answer
446 views
How to test internal resistance on small lithium polymer cell?
I'm coming from a computer science background, and will be writing some software to automate battery testing. I have background in math, but little to none in physics or electronics. Please consider ...
5
votes
4answers
308 views
is the resistance in ten meters of copper wire too high to use in a circuit powered by AA batteries?
I have a wireless security system at home, and the wireless node is too far from the receiver. I was thinking that I could splice about 10 extra meters of wire into the existing line to move the node ...
7
votes
2answers
2k views
Internal resistance of batteries?
In one of the answers on this site, I found link to this project. That article mentions internal resistance of batteries and cells. Where can I find data about common ranges of internal resistances ...
