The amperage tag has no wiki summary.
0
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4answers
97 views
Heating wire filament with low voltage / amps
Is it possible to heat either nichrome or copper wire (both 40 awg) with the following low-power delivery of 3.5 Volts, 7.4mW and 2.11mA?
This is very low power delivery and we're wondering if 3 ...
1
vote
2answers
71 views
Correct AMPS & volts for DC motor controller
I'm definitely an amateur hobbyist, but I need to fix something for a friend.
I have a existing DC motor and the controller is shot. The motor is rated at 0-90 VDC (5Amps)
I wanted to see if this ...
3
votes
3answers
311 views
220V 0.2A converted to 12V 5A, where are the missing amperes?
I have an AC adapter at home that reads (roughly) the following:
uses 220-240v AC 50Hz at 0.2A
produces 12V DC at 5A
I'm a little surprised that it uses 0.2 amps and produces upto 5. Here's what ...
1
vote
3answers
94 views
Is it always safe / reasonable to replace a power supply brick with one rated for more amps? [duplicate]
I am specifically looking to replace a 12V 3A power supply that seems to have disappeared from a backup HDD. I found a 12V 5A power supply with the right connector on Amazon, and ordered it without ...
-2
votes
3answers
84 views
Converting voltage to amperage [closed]
I was wondering if power transformers can be used to convert a high-volt/low-amp AC to low-volt/high-amp AC.
For example:
AC power input (E±=100 I=1) to a transformer primary (100 windings) and ...
-3
votes
1answer
75 views
calculating the battery amperes to connect with UPS?
I have 500 watt UPS, which outputs 220v and 50Hz. The calculation says that I need 500/12v = 41.67 Ampere and 12v battery to use with this UPS. But mostly people around me suggested 120A/h battery. ...
1
vote
2answers
70 views
What affect more the battery time: mA or V?
I will create a small circuit with a battery and vibration motor. I will use a 3V coin battery with 100 mAh.
So, I can use a motor:
With 3V and 75mA
With 3V and 150mA
With 1.5V and 75mA
With 1.5V ...
5
votes
2answers
226 views
How to adapt a 100 mA DC ampermeter to measure up to 5A?
I have a DAS(Data acquisition system) that can measure DC (up to 30V) and I want to know what is the power a device is consuming, the current measurement available for that DAS is in the range ...
1
vote
3answers
169 views
How do I provide a variable 4-20ma input?
I'm working on an embedded project that takes has an input that ranges from 4-20ma. This is normally provided by an external controller, but I'm working on a test bed.
Controlling voltage is easy ...
-1
votes
2answers
129 views
Can I charge my iPod touch with 650mA? [duplicate]
I have a converter for my cellphone that converts to 5V, 650mA. I guess the voltage (5V) is the same used in USB, but the amperage is 150mA higher. Is it unsafe to charge my iPod at the higher ...
1
vote
1answer
65 views
Mimicking an adapter with a dc power supply [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
Is it possible to set up a DC source of power for a laptop so that it mimics the specs of the adapter ...
11
votes
2answers
292 views
If supply amperage is higher than max. amperage, do I need a resistor?
This is a pretty basic question, as I'm still learning the fundamentals of electronics. I understand the analogy where amperage is compared to the quantity of water moving through a hose.
I have a ...
0
votes
0answers
26 views
What Powersupply Does the Vigor 2850Vn Take? [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
I recently Bought a Vigor 2850Vn Router from ebay.
This did not come with the original power supply ...
0
votes
1answer
169 views
LED setup with 110 standard outlet [closed]
I am attempting to grow an indoor garden. I would like to purchase LEDs to help grow my plants. Can you help me understand everything I need to power my LEDs (and not catch anything on fire). From my ...
0
votes
1answer
260 views
L7805CV 5V Voltage Regulator to IP camera over POE
Hey all i am having a problem with getting my IP cameras to work over my home-made POE cable.
The parts i made in order to have POE are the following:
L7805CV 5V Voltage Regulator (for input to the ...
1
vote
3answers
564 views
What resistor to use with this RGB LED?
i have this led, and im not sure what resistor to use to drop the 5v current to an appropriate voltage and produce the appropriate current.
the LED is rated at 200mA, but the data sheet says i ...
0
votes
0answers
35 views
Can I use a 12V / 2A power supply with a 12V / 1.3A motor? [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
I just ordered this motor, and the description says it was tested with a 12V / 1.3A power supply.
Now ...
2
votes
3answers
230 views
using led stripes with external battery: any side effects?
i have to power some led stripe from ikea with a drill battery:
On led stripe power is written: 12V 0,25A. and on drill power: 12V 2A.
Now i want to power n led strip (for example: n=4) and i ...
5
votes
2answers
334 views
Comparing A to Kwh, can it be done?
I have read this page: How to convert amps to kilowatts
I often purchase electricity from a supplier to power computing equipment within a data centre. Some sell me 10 amps, some sell me 2.16 kWh.
...
2
votes
1answer
192 views
Voltage/Amperage load rating
I'm a newbie when it comes to electricity, and this has been bugging me since like 9th grade when I first learned about V/I/R/P combinations, and to this day I still can't wrap my head around the ...
4
votes
4answers
1k views
Electric shock : what risk working with a 6V power supply?
I am planning to cut the end connector of this power supply to work on it and build a dummy 4 LR6 1.5V pack.
But I wonder : is there a risk to have an electric shock manipulating those wires while ...
2
votes
3answers
365 views
Basic wattage and volt conversion when using solar panel
I have a basic electronic question or two I need to ask.
I want to use a solar panel which delivers 5.2W and is rated for "8V open voltage and 650mA short circuit". If I connect a 5V voltage ...
2
votes
3answers
229 views
Power supply too weak, any danger?
I have a car console that i wanna test on my work bench. It's rated at 10A DC max @ 12v, but I don't plan on driving any speakers, so the draw should remain fairly low. My power supply can only ...
4
votes
3answers
3k views
How to determine the best diameter for a cable?
In my understanding having a cable that has a too large diameter can lead to power dissipation, having one that is too small can lead to the same result.
apparently the second case is much more ...
0
votes
2answers
316 views
Laptop Adapter current request [closed]
My Lenovo SL500 AC Adapter has broken and left me without a way to charge my PC.
It's Output Specs were the following:
20 V
4.5A (4.5A)
90 W
I had another Lenovo AC Adapter for a different PC of ...
0
votes
2answers
3k views
Charging devices - Voltage and Amperage
When dealing with voltages and amperage, which one can destroy your equipment when not properly matched to the proper device? Am I correct in thinking that attempting to charge a device with an ...
7
votes
3answers
2k views
How to measure current to a DC motor?
I'm trying to measure current to a DC motor on an RC car I took apart. The car is powered by 3 AA batteries and seems to be made of three different boards. Two of the boards are for switches and LEDs, ...
2
votes
1answer
163 views
replace 20A switch with 16A switch
On a space heater, I replaced a 20A DPST switch with a 16A one I found at radio shack. I am unsure about the amperage of the circuit itself (how to find this?) but I'm assuming it's 20A or else the ...
1
vote
1answer
496 views
Is there an Amp + Volt-meter on a chip or should I use the Arduino Analog?
I'm thinking of building a general purpose battery charger. It would charge LiPo packs, 9V, AA, AAA, etc...
I've been doing a bit of Googling and read that the internal Phone charging circuits tend ...
2
votes
2answers
438 views
max amperage of WAGO 222-415 connector?
Here's a really nice multi-wire splicing connector:
http://www.wago.us/news/5019.htm
I'm using it for power distribution for a quadcopter:
...
