Tagged Questions
-3
votes
0answers
40 views
How long does my battery last? [closed]
The only information I'm given is that each battery has a useful energy of 100000 Wh (500 Wh/kg), my discharge rate is 10C, and has to power an electric motor that should output 1000 kW. I'm having ...
1
vote
2answers
135 views
Problems when sharing a battery between motors and radio in an RC car
Background
I am building an RC Car that I am trying to modify to control from an Android phone.
When I connect the remote control module as well as the car circuitry (servo & motor) to separate ...
-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.
1
vote
2answers
169 views
Fix the Problem for Shunt Resistor due to Temperature & Current Sensor
I am trying to build a current sensor here. My original thoughts starts from this paper [real-time current-waveform sensor with plugless energy harvesting from AC power lines for home/building ...
2
votes
2answers
95 views
Battery Charging Current Determination
When charging a battery using a solar panel, or even another battery, how is the current flowing through the battery determined?
Will the internal resistance of the battery draw a certain amount ...
-2
votes
1answer
114 views
Current amplifier concept in solar panel [closed]
Whether the output of the solar panel is given to a current amplifier to increase the ampere rating? So that we can increase the ampere hour rating of the battery which will be connected to the solar ...
1
vote
1answer
288 views
Help with PCB design with current sense resistor
I have to perfomr battery characterization(power and current consumption measurement) of an embedded system module. I have embedded PCD and an Battery pack PCB.Therefore I am planning to include the ...
6
votes
4answers
543 views
Pulse-powering heavy loads with a coin cell
Lithium coin cells are rated for fairly low standard current draws, on the order of 1 to 5 mA. Also, while they allow greater pulsed current draws (i.e., periodic bursts), this appears to be ...
0
votes
1answer
91 views
What parameters affect battery charge time?
What parameters affect battery charge time? For example if we're interested in designing a charger for mobile batteries, what parameters should be considered? What happens if a little higher voltage ...
2
votes
2answers
194 views
How to best estimate power consumption for a system?
I'm not an engineer, I'm a software guy getting into hardware - so bear with my ignorance!
I'm in the process of building a system with many components (e.g. a computer, many sensors, a few motors, a ...
0
votes
2answers
161 views
Do I need to add a current limiter to this battery pack I'm making?
I have a motor that came with a 9 volt, 1.0 amp AC to DC wall converter to power it and the text next to the power connector on the motor seems to indicate 9 volts @ 1 amp is the preferred input. I ...
4
votes
4answers
348 views
Overclocking my toothbrush
I use these toothbrushes: http://www.amazon.com/Oral-B-Advanced-Toothbrush-Vibrating-Bristles/dp/B00336EUV8
They tend to run out of battery quite quickly. I'm happy to keep buying more because ...
8
votes
4answers
687 views
Pumping a few Amps for a 100usec
I like to pump 4-5A to a high power LED for 100usec. My system has only 3.3V battery, this 100uSec high power event takes place once every 10sec.
What is the best way of doing this without upsetting ...
1
vote
0answers
243 views
How many affordable lithium polymer batteries would it take to safely jump-start a car?
I have a couple of these incredibly powerful 12V battery packs and I got thinking about how feasible it would be to MacGyver an engine starter out of them.
These things are rated on the package to ...
5
votes
1answer
98 views
Issues ascertaining current x time for battery life
It is simple to calculate a continuously-on device's theoretical battery life based on the battery datasheet capacity (assuming always nominal voltage, etc.)
An LED @ 20mA..
...
4
votes
2answers
338 views
Have I got these simple power calculations right? (for battery consumption)
Lets say an ideal AA battery I have provides 2.0 Watt hours. It could be different, just a quick search for this example.
My very simple load is the battery connected to a 5mm LED. The LED has a ...
1
vote
3answers
254 views
Would any current flow when batteries and resistors are set up like this?
What would the current flow be through the 1 ohm resistor? They are constant voltage sources, not batteries.
4
votes
3answers
191 views
Simple voltage drop question
I am working on an antenna and ATMEGA-based reader. It is powered off of 2 6v deep-cycle marine batteries, and the reader/antenna draws 1 amp at 6 volts. I'm not sure about the amp-hours in the ...
16
votes
5answers
5k views
Current flow in batteries?
I am reading a basic electronics book: "There are no Electrons: Electronics for Earthlings" and I came across a clever passage about the fact that you need a closed circuit in order for current to ...
