Questions tagged [amperage]

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

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73 views

Will this battery case be able to sustain 3.5 amps?

I'm trying to make a 10S Li-Ion battery case, and I'm currently wondering if it will be able to sustain a current of 3.5 amps running through it. I like to believe I'm pretty good at electricity, ...
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35 views

transformer for a 220v stove/oven to use on a 110v outlet [migrated]

I'm remodeling a section of my house to add a second kitchen, but I don't have a 220v outlet in the room (I'm in North America). To my surprise the 110v North American outlet next to the future stove ...
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53 views

Amperage vs voltage

We've all learnt about their differences, amps are for current and voltage are for potential difference. They are proportional with resistance and all that. I'm confused by their purpose. What are ...
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1k views

If a device is rated at 12 V/80 mA what does that mean as far as the length of time that it will draw 80 mA?

I have an electromagnetic device designed to hold a fire door open until either the circuit is cut or the building's electrical supply goes out. At which point the door is released and will close. It ...
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1answer
55 views

DC amps fluctuating when measuring?

So as some background, I have a bathroom exhaust fan with a built-in Bluetooth speaker. By default, the speaker is powered only when the light is on, but my goal is to have that on all the time. The ...
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37 views

Understanding lower voltage’s effects

Let’s say I have a surge protector that has a 15A cable that is rated 1875 watts at 125V. If my voltage is low, let’s say 105V the amount of watts it can supply will drop? So its max safe output ...
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Just not sure - USB/Charging Pad [duplicate]

I have a "wireless" charging pad that is 5v 2a and I can't find a plug that matches the amperage. I have a 5v1a, 6v 800ma, 5v 250ma, and a 5v 500ma, so what can I use to make sure that it's not ...
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57 views

How can different voltages produce the same short circuit current?

I hope I’m not just thinking past something trivial but I can’t make sense of this. In this video, https://m.youtube.com/watch?v=XDf2nhfxVzg , variable voltages from .1-20V are used and when he shorts ...
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52 views

Why does this circuit cut out when an extra load is added?

I have a circuit that consists of an Arduino controlling a small PAM8403 based amplifier which is powered via an L7805CV voltage regulator. When I press a button the arduino sends an audio signal to ...
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33 views

Led Light Strips Power Consumption and Help On How to Go About These

So I've been planning to purchase some LED lights to go around my room (61 ft), I want to get the Day better light strips linked below and Ive read around to figure out whats going on. So the strips ...
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1answer
43 views

Understanding CFLs in Electrical Circuits

I wish to have a better understanding of how CFLs work in a electrical circuit like a home. A CFL broke a little towards the top when I touched it. I noticed it light up at the bottom and then made ...
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1answer
57 views

How to determine what wire size to use [duplicate]

I feel like I have gone down a rabbit hole and came out knowing nothing. I understand this is a really basic question. My son and I are building a simple RC. It is using 4 1.5v (AAA) batteries in ...
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5answers
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5V LDO blowing up only when testing current draw

I have a circuit to power some 5-volt logic from a +24VDC source. It has some basic reverse-polarity protection and uses a TI 5VDC LDO. It all works great during normal operation however, when I use ...
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1answer
88 views

How to increase Amperage while keeping the Voltage the same

I currently have an Arduino Uno board which has an output of around 5V @ 900mA. is it possible to bump up the Amperage to around 3-4A while keeping the Voltage the same? Maybe with a Transistor, but i ...
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exceeding an analog ammeter printed scale

I have a ~$10 DC ammeter I mail ordered however long ago, on the display is printed Dagatron 7203 and on the lower right side of display is an upside down U ...
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2answers
69 views

Amperage and Voltage Question: The Water Pipe Analogy

Since Voltage is like water pressure, and Amperage is like the volume of water being pumped, in a given hose (wire), there's a volume threshold based upon its diameter (AWG), but only in relation to ...
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1answer
70 views

Powering a crane/claw [closed]

I bought this claw (it came with no instructions): It has 2 wires only. By default the claw is open. When I power it, it closes. With 5V it barely moves, with 12V it closes but the strength is too ...
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2answers
70 views

Amperage limiter?

I'm looking for a component that essentially limits the current passing through it, but unlike a resistor, its resistance is not constant. When the current passing through this component is below the ...
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1answer
102 views

Is it possible that the ampere high than the volt? [closed]

Is it possible that the ampere high than the volt? for exemple if i have 5v and 6A and how its possible that there is 30 watt and 5 volt charger?
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How do I calculation to see if Thyristor complies with DO-160G indirect lightning protection

I have been working with TVS diode and found that the capacitance of tvs diode is large; therefore, I will not be able to use tvs diode. Thyristor, on the other hand, has low capacitance for high ...
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1answer
35 views

Approrpiate Guage wire for 12v 1amp power supply?

I am looking to power a Wineguard 12v Antenna Amplifier off a pc power supply. However I am wondering what gauge wire is right. The run will be about 4 feet total (2 ft each direction) at 12v with a ...
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1answer
65 views

High power amps

Can anyone help me with amplifying a 5V 200 MHz sine wave for a project related to Volumetric Electromagnetic Phase-Shift Spectroscopy? I require a sine wave through a coil which has 200 MHz and can ...
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1answer
142 views

Circuit doesn't seem to add up under Kirchhoff's laws

I'm supposed to do a full circuit analysis of the circuit above for homework, giving all voltages and amperages, but I cant figure it out because the elements don't seem to add up under Kirchhoff's ...
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2answers
124 views

Why is my Transformer pulling so much current?

I have taken a microwave oven transformer and removed the 2nd winding which originally put out 2000 volts. I have rewound the 2nd coil to produce 21 VAC which I then rectify and smooth with 2 large ...
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118 views

Are amps provided or drawn?

I am trying to understand how amps work exactly. I see variations of the following in various online sources. From here: [...] A standard household circuit that supplies your outlets and switches ...
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1answer
50 views

Transformer vs. switched-mode power supply

I'm working on making my own bench power supply, I want up to 7-8 amps. The switched mode power supplies are much cheaper than the transformers. Why would one choose a transformer instead of switched ...
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124 views

Can I decrease voltage to get higher amperage?

If I have for example a battery that outputs 10 V but with a maximum of 0.5 A. If I took the output of the battery and entered it in a buck converter to get 5 V will I get the same 0.5 A at 5 V or I ...
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2answers
75 views

Why is voltage specification irrelevant in tripping a PPTC polyswitch?

In a circuit, a resettable fuse (or polyswitch or PPTC) is a kind of breaker component that trips when the AMPERAGE exceeds a given treshold to protect against overcurrent faults. PPTC basically ...
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0answers
64 views

Problem calculating fuses

I am calculating a fuse and I'm having a bit of trouble. I have a 12v 2A power supply that I want to protect, so my first thought was to place a fast 250v 2.5A fuse in series so it should blow if a ...
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2answers
79 views

why volt is needed for calculate watt? [closed]

hello i dont sure what is the difference between voltage ampere and watts. voltage is only the potential difference between points high voltage will not cause to the electrons to move faster so why ...
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1answer
48 views

Problem Powering 13.3 inch LCD Screen with 3.7v Battery [closed]

I have been working on a project that involves running a 13.3 inch lcd screen off of a rechargeable battery. I bought the lcd screen and controller board listed below and verified that it was working ...
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8answers
4k views

What is negative current?

I understand that voltage is relative to ground, so that can be negative. However, I'm currently looking at current-sensors (ACS712 current sensor) and in the performance characteristics table, it ...
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2answers
442 views

Why does the measured current differ from the calculated current in this circuit?

I have the following schematic: Now I want to know the (more or less) exact current flow in my circuit. For this I did the following calculations: I = V / R I = 5V / 330 Ohm I = 0.015A = 15mA So ...
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2answers
124 views

Unexplained amperage spikes

IT guy here - I have a device called a WattBox in one of my networks so I can remotely cycle power on an outlet. It also provides me with alerts when something falls outside set parameters. I've ...
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1answer
72 views

At what point a battery becomes a load

This has probably been asked before but I don't know how to search for it. In a circuit where there are a battery and a variable power supply, what conditions have to be met in order for the battery ...
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3answers
96 views

240 volts circuit amp

Basic question, but I have a doubt! I have a pool heater that works from 240 volts. In order to calculate the annual operating cost, I installed a device that measures amperage and adds up the total ...
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2answers
44 views

Hedge relay current capacity with additional wiring

I ordered several OMRON “ice cube” 110 VAC relays, contacts rated for 10A (LY2NJ). When I inspected them under a microscope I noticed the contact wires are AWG 24. The rest of my setup uses AWG 18. My ...
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1answer
177 views

Building a Huge 18650 Battery Powerbank DIY [closed]

I know there are a lot of threads about this topic already, but I still have some questions about it. Anyways, I am thinking about making a 50-80 thousand mAh power bank depending on the batteries and ...
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0answers
72 views

Lower amps than expected?

I build an inverter to power some panels of EL paint (If you don't know what EL paint is check out this link). It puts out some very high voltage and I thought I'd check to see what amperage it is ...
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1answer
113 views

How to reduce 30 amps to 5 [duplicate]

I recently bought a Transformer so that I can make an ionic lifter but it has a max 30 amp output and I’m sure that is way too much for what I need plus Since I have this plugged straight into the ...
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1answer
62 views

How many amperes can pass through drain-source of a FQPF9N50C if 3.3v are applied to gate-source?

I a playing around with this N-channel mosfet I found at home (FQPF9N50C). Using this simple circuit: I am able to turn on an off the 12v load using by connecting 3.3v to the mosfet. The load is a ...
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2answers
204 views

How to determine cross section of cable [duplicate]

I'm looking at this table that suggests a 0.5mm2 cable could withstand 720W at 3A. At the same time I used a cable size calculator online to determine the size of cable I would need to use for a ...
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2answers
74 views

What's the suitable wire size for 9VDC @25 Amps line?

I am trying to put together the requirements for a cable and I was wondering what would be the most suitable wire size to load the DUT with 25Amps @ 9VDC. I will have few other high current lines ...
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1answer
110 views

Multimeter seems to be giving incorrect mA reading [closed]

I'm measuring the current drawn from the negative battery terminal of my car battery. I am not sure if the correct reading is 0.16 A or 1.6 mA. I tested with my multimeter on both 10 A and mA ...
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2answers
174 views

Stacking M.O.T. to create an E-E core

I just came across this site looking for answers on some questions I have concerning microwave oven transformers (M.O.T.). I am currently going into my third year as an E.E. student and I am trying to ...
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3answers
74 views

What connectors should I use with 5V DC current?

In a personal project, I need to power several 5V appliances which, together, use up to 12A. I want to use a 60 inch cable between a case to which those appliances are connected, and the transformer ...
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1answer
54 views

Wheelchair battery life calculation

Apologies because I'm sure this is an incredibly basic question and I've tried to work out the answer myself but I'm getting nowhere with it! I'm looking to get a powered trike attachment from my ...
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1answer
50 views

Have I burned out my HD motor? [closed]

I accidentally cross connected my external HD and my computer power cables. Only noticed it when my computer complained it was not charging. MY HDD is no working but I have had problems with it ...
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2answers
91 views

Advice for using 60 watt peltiers? Is 12V 3A enough to get the job done?

The weather right now is so bad and hot! A friend of mine runs a mobile stream and his phone refuses to charge when it is hot. His stream crashes because he can't charge his phone or it overheats. Not ...
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0answers
115 views

Why are all my motors and transformers failing at this specific location?

At my job there is a vacuum oven. There is a 50 hp, enclosed cooling fan. that circulates N2 gas upon quench, the design of the unit runs 480 volts through a reduction transformer to 230 volts. This ...

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