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Questions tagged [amperage]

Amperage is the strength of an electric current in Amperes (Sometimes shortened to Amps).

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Solar cell outputs full voltage but barely any amps

So I've asked a similar question in the past, but I'm still curious about something. On a fully sunny day, the solar panel tops out at 5.5v @ 260 mA. On overcast or cloudy days, the voltage stays ...
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1answer
49 views

Can I use a 24V 1A AC/DC adapter on a 9V 2A device? If so, are there negative effects of doing this? [duplicate]

I have a gaming chair with a speaker built into it and I lost the cord for it. I managed to find an old xbox 360 cord that fit it but it’s 24V. The chair turns on with the 24V cord but I’m trying to ...
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62 views

Reducing Current?

Having a problem with my EV a converted Fiat 500. The conversion is made with part from companies that dont exist any more, so it is hard to get information about them. The car have two batterybanks ...
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1answer
53 views

guesstimate max current of a domestic appliance

The appliance is a quartz oven, 1000W @ 250V. I am trying to obtain a max transient figure for the current (no oscilloscope on my bench). Opened the oven and checked the writings on various parts - ...
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1answer
54 views

USB Port Amperage

So I have built a Benchtop Power Supply out of an old computer power supply to power and test misc. gadgets I have created. I would like to attach 2 salvaged USB ports from a junked computer to the 5v ...
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0answers
36 views

does a higher amperage source help prevent voltage sag?

I'm currently troubleshooting my car's ongoing electrical issues and during the troubleshooting process so far I have gone through multiple OEM alternators and multiple OEM & non-OEM batteries. ...
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2answers
45 views

do the voltage and amperage applied to a motor matter as long as the wattage stays at what its rated for?

I have an electric 180w motor from an electric go cart which currently runs on lead acid batteries but I want to convert it to have a 18650 battery pack for a power supply but I cant find the rated ...
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37 views

Charging Phone with a Modified Power Supply [duplicate]

I have converted a computer power supply into bench top power supply and I am now ready to add some USB ports to charge various devices. On the power supply label it shows the 5v rail is capable of ...
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1answer
48 views

How to lower amperage? [duplicate]

I have a power source that gives 5V DC and 700mA. I need to power a ventilator that requires 5V DC and 500mA ± 10%. What is the best way to lower the amperage, would a 10Ω resistor do the trick or ...
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2answers
89 views

What amp rating of 24vac transformer for LM317T

I am trying to post a new question about the lm317 to-220. I just want to know what size transformer for lm317 at full 30vdc. I know its a 24vac center tapped transformer but is it 1 amp or 5 amp ...
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2answers
158 views

9V battery to 850mA [duplicate]

I am new to electronics and trying to produce 850mA out of a 9V battery. I am just wondering if this would be possible and if so, how to do it.
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1answer
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Does wiring 18650 batteries in parallel and/or series increase the discharge rate of the whole pack?

I cannot seem to find a solid conclusive answer anywhere on this, but if I build a pack of 6 18650 batteries in parallel which are 3500 mAh each, that would make the pack 21 Ah in total. Then I take ...
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1answer
38 views

Batteries Spike in Watts and Amps Pulled with less than 50% Life

To give a background on this, I have been running tests to determine the actual lifespan of a 3 cell pack of some Samsung 18650s and Tesla 2170s at just above freezing. The Samsungs are INR18650-35E ...
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1answer
67 views

How to select current for power supply? [duplicate]

I've two step motors with 12V-0.4A each, A4988 as stepper motor driver and CNC shield on Arduino. As I know I should use at least 2x voltage for stepper motors and I would like to know, if I use 24V-4....
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3answers
73 views

Maximum safe amperage for LED Strips

A lot of online resources never question the use of high amperage power supplies for powering LED Strips. As an example, 5 meters of low density (30 LEDs per m) WS2812B strips already use ...
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1answer
132 views

Understanding 5V to 1.8V UART level-shifting circuit

Hopefully it's OK to ask very basic electronics questions here. I had a TTL 5V UART cable, however the board I had only accepts 1.8V max. So I found some online schematics that uses resistors and a ...
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1answer
69 views

Ammeter scale, not sure what my amp reading is

I have a basic multi-meter that I am using to measure amp on a load. I am trying to figure out how much amps my small entertainment system draws. (LCD TV, PC, speakers.) I want to build a small DC ...
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2answers
78 views

Can I use this relay?

I got this relay. In the product description they say: "belastet bis zu 10 Amp/250 VAC, 5 Amp 30 VDC." which means: "charged up to 10 amp / 250 VAC, 30 VDC 5 Amp". On the relay it is printed: 10A/...
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3answers
37 views

Predictions based on resistance measurements not matching reality?

I'm using my multimeter to measure the resistance of my tongue, and leaving it on there for a full minute it seems to average out at around 1.5 Million Ohms. However, when I put a 9 volt battery on ...
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1answer
149 views

Why can my body conduct electricity from a 9 volt battery?

I've created a scenario represented identically in the attached image . My question is this: When I connect Jumper 1 to my left hand and Jumper 2 to my right, the LED turns on very faintly but I feel ...
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1answer
71 views

Crude Li-Po Battery Charging. Is it safe?

So I have this drone and I want to play with it but there are no chargers for it nor are there cables for this kind of li-po here but I have minimal knowledge with electronics, just enough to make ...
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2answers
57 views

How do I interpret an RGB LED max amperage given as a range e.g. 30mA-70mA?

I have some LED's I got in a mixed package and the RGB LEDs instead of a single max amperage just list a range. One example is I have a common cathode RGB LED with ratings listed as 1.9-3.4v and 30mA-...
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2answers
96 views

When is it better to have a high voltage and when is it better to have a high current? [closed]

What are the advantages of each? What situation would I want higher amperage than voltage, and vice versa?
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1answer
53 views

How to replace push buttons on an intercom?

This is the intercom panel in my apartment, it's 30+ years old and I want to give it a face lift. The push-buttons are momentary, and I want to replace them using modern ones like these, but I'm not ...
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2answers
103 views

Is it bad practice to connect wires of vastly different gauges?

I would like to connect an Anderson plug with 25mm² cable to a 12V AGM battery so that I can easily connect and disconnect different devices which will conduct currents of varying amperage. I may ...
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1answer
76 views

built in charge controllers take amps they need?

Many devices have built in charge controllers that stop charging when battery is at 100%. I read several places that you can charge devices with the manufacturers recommended voltage and that higher ...
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0answers
28 views

Responsible Battery Reserve Capacity and Low voltage?

It's been asked here, but looking for clarity. How bad is it to undervoltage a 12-volt lead-acid battery? SLI automotive starter batteries list RC (reserve capacity), but I think this a usable ...
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0answers
47 views

What power socket for a blue P+N+E plug with an amperage of “2 x 13”?

apologies for the potential stupid question but I've never seen this before. I've got a second-hand bit of kit which comes with, what looks like, a normal blue P+N+E plug however stamped onto the ...
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1answer
153 views

Trying to increase amperage of Arduino Uno digital pin (20mA) to control a cabinet lock that is rated at 12v / 2A

I am trying to use my Arduino Uno to send power from one of its digital pins to a cabinet lock, the cabinet lock is "fail-secure," so you send power to it to unlock ...
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1answer
32 views

Struggling to limit current

In short I'm building a relay controller and want to limit the current going to specific relays. My power source is 12V DC @ 20A. For one relay I want to limit the current to 10A and another to 2.5A....
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1answer
84 views

What defines Volts, Amps, Watts and mAh?

My current understanding is as follows: Volts: Speed of electron flowing. Amps : Number of electrons flowing. Watts: Amps x Volts measured for "some" time. mAh: Very confused to come up with ...
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41 views

Voltage and amperage requirements for resistance heating of glass

I am planning to introduce electric heating/boosting in my glass melting furnace. The present temperature of the glass is around 1200 deg C and I need to raise it up to 1300 deg C. I am trying to get ...
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2answers
72 views

Is my radio pulling more current than it should? [closed]

I have an FT-747GX radio that I am using as a RF generator for a plasma cleaning machine. In the operating manual on page 3 it states: I have a power supply connected to this radio which outputs ...
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2answers
63 views

Can I use a pc case fan for a tumble dryer? [closed]

My tumble dryer is broken. I found the service manual online and according to the error number the heat pump fan is the problem. I open it up and to my surprise I found a standard sized case fan in ...
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1answer
98 views

Is less than 1A enough for TP4056 module to charge one battery?

I want to charge 3 separate 18650 cells with one charger. Each one of the batteries has their own TP4056 module. So in total there are 3 TP4056's. I know that TP4056 is rated at 1 amp input, though my ...
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2answers
109 views

Transformer - I connected 50k resistance which burnt - why? AC

Wall supply gives as much power as a component uses. I'm trying to connect a 800W transformer to produce an arc of electricity. But I can't exceed 10A because home fuse will triger (so every device ...
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2answers
108 views

How does a high amperage (100 Amps or more) MOSFET handle the current flow without overheating?

High amperage MOSFETs like the 511-STP200N3LL say they can handle 120 Amps of current. Is this possible? If yes, then what prevents the small wires coming out of the device from melting or getting ...
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5answers
118 views

A basic question about amps, watts, and charging batteries

Why do we speak of watts (and not amps) when we refer, for example, to the "7.5W Wireless Charger for iPhones," but when we talk about cord-based USB charging, the specs typically refer to amps (and ...
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3answers
97 views

How big does ground need to be? Step down from 5v10a to 1.2V 50a, do I need a 50 amp ground?

I'm just a layman. I was just thinking about CPUs in computers. They run at about 1, 1.5 volts or there about, sometimes even lower. Desktop cpus can take 90 watts, some 120 watts. That's close to 100 ...
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2answers
84 views

PIC interface with Relay

I am interfacing a PIC16F877 with a 5V DC relay. I hooked up the relay to the same 5v that power up my PIC with the appropriate transistor, diode, voltage to power up an LED to NC and LED to NO, I ...
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0answers
50 views

What factors should I consider when choosing a high amperage power supply?

I've searched around, but I haven't found an answer to this particular question yet. I'm building an elecromechanical project which requires somewhere around 60 Amps at 12 Volts. While this may not ...
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1answer
67 views

Which current can a multimeter measure for an indefinite duration?

It might vary, depending on multimeter. But if on a multimeter, there is printed "10A for 30sec. MAX every 15 min" or "20A for 15 sec (time unspecified)", below which approximate threshold is the ...
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2answers
40 views

In powering household devices, is the voltage preset and the amperage varies as needed?

When powering household devices, does a power adapter have a preset (or in some cases user-defined) voltage, while the device (while turned on) "selects"/draws whatever amount of amperage it needs at ...
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1answer
33 views

Calculating power drawn or ampere allowance

I just want to confirm the calculations for the following scenario. I have an equipment with the following specifications: ...
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1answer
51 views

Supplying relay board with mains voltage [closed]

I bought a relay board (this one) that can handle 10A at 250V, my question is: if I wire a mains supply into it, say from a ring circuit (that powers sockets throughout normal houses). Will the relay ...
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1answer
53 views

How is the energy consumption of a ciruit component calculated?

I know that watts are equal to amps times volts, and that watts are a rate of energy consumtion. I have looked at some circuits, but I am unsure of how the total energy use is being distributed. My ...
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1answer
128 views

Can i use an AC 15A 250V / 30A 125V rocker in place of a 15A 125V / 10A 250V one?

Amazon sent me the wrong replacement switch so i am wondering if i can use it? Original switch is AC 15A 125V / 10A 250V new one is AC 15A 250V / 30A 125V can i use it without damaging the ...
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2answers
85 views

Why does curling a wire decrease its amperage/wattage? [duplicate]

I picked up an extension cord today, and I noticed that it had a different value for its wattage and its ampage, based on whether the cord is wound around its base or not. (I apologize that the ...
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1answer
38 views

Amperage discrepancy on computer PSU

I have a 500W PSU that has both 12v and -12v supply rails with the dual +12v rails rated for 360W (20A each) and a single -12v rail rated for 9.6W (0.8A). My question is; if I was to power something ...
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1answer
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Is it ok to mix converter and extender cable with different amperes? [closed]

I have a charger for my laptop which needs a converter to hook up to local sockets. On the converter it says 250V and 10A I have an extension cable that says 250V and 16A Is it ok to plug my ...