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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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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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61 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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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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42 views

how long will a 120amp battery last [closed]

hi I have a 120ah battery my radio runs at 100wats and draws a max of 22amps how long will the battery last thanks rob
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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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128 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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27 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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71 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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40 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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70 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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61 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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45 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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94 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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70 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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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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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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78 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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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
63 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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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
30 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
47 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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46 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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95 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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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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36 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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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 ...
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1answer
46 views

LED strip power requirement [closed]

I have an approximately 1 meter LED strip in "warm white" running from a 2 amp power supply for some time now with no problems. I want to add another strip, of about 2 meters, to this same power ...
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2answers
99 views

What if the current draw is greater than the rated discharge of a battery?

I have a 48 volt, 20 kW motor that I need to supply with power. I am looking at a configuration of 16 LiFePo4 cells each in series, each 200 Ah rated at 1 C. At that rated capacity, it would seem ...
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1answer
53 views

Can an electrical wiring system carry enough current to create an EMP?

I'm writing a spy story of sorts and I demand realism in my writing. In one of the chapters an agent, working with remote hacking assistance, enters a datacenter to steal digital certificates. When ...
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44 views

LED setup, general questions regarding amps

I'm trying to fully understand the limitations of amps when using a few various devices. I tried to understand amps via this post: Voltage at what Amperage Specifically: So, the possible ...
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122 views

Why do our electrical utilities use transformers way over their rated KVA?

My parents' house and my house have different electric utilities, but both are rural electric cooperatives. We both have 120/240V (60 Hz) split-single phase service (this is in the United States state ...
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50 views

Decrease voltage in circuit

If I have 90 VDC 3.5 A, and I want to reduce to 12 volt, in excellent efficient the amps will be around 25 A. Can I use a 12 V L7812 regulator?
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48 views

How can I change the circuit or the current to effectively heat up the diodes based on their current rating?

I'm extremely new to electrical engineering, and I was experimenting with diodes in series. I soldered six 1N4007 diodes together, and I connected them to a DC power supply (RSR ET122) with a constant ...
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Can I use a power supply with the same voltage but a different amperage? [duplicate]

I have an old router with a 12v 1.5a rating, and its power supply died so I'm using a 12v 1.2a power supply. I have a MIDI keyboard with a 9V 500mA rating and I have a 9V 200mA power supply and one ...
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51 views

UL Listed Item - fused, but plug rated higher than wiring

We are installing an item and have some concerns. The supplier is claiming we will void the UL listing and warranty but the current configuration seems unsafe. I am curious if the following would be ...
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1answer
48 views

Current change through Series resistors

My question surrounds a simple scenario. I have a 12V DC power source connected to 2.2kΩ/10kΩ/22kΩ resistors in series. For an assignment, I have theoretically calculated Voltage drops across all ...
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234 views

Can a 320 watt solar panel with a 100ah battery run a 70 watt fridge?

Can a 320 watt solar panel with a 100ah battery run a 70 watt fridge? I really need help on this question pls.
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make LED 12v light fixtures

I would like to remove the n27 sockets from household light fixtures and replace them with LED lights used in the automotive industry. I would like to put a reasonable amount of LEDs in the fixture to ...
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1answer
240 views

Can I use a 150w 12v 775 DC motor with an old 800w PC PSU?

Is it possible to use a 150W 12V motor with a PC PSU? I know that it means that motor will draw a current of 12.5A from the PSU. The PSU can supply 20Amps in total on the +12V rail. As soon as ...
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1answer
24 views

Charging rate for deep cycle 12v battery

I have a 75 AH deep cycle battery(AGM) and I have a battery charger with 2 modes, 5.5A for car, 2A for motorcycle, as far as I remember, lower charging rate is usually better for longer battery life ...
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1answer
301 views

What is Maximum Average Forward Rectified Current? (1N4001 Diode)

I am wondering if someone can explain what Maximum Average Forward Rectified Current means for a diode. I see that this is marked as 1 Amp in the datasheet for the 1N4001. I have not been able to find ...
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1answer
70 views

Charging a device with higher amperage, can somebody please clear up the confusion and contradictory statements?

I have a PS Vita I wish to charge with my Samsung Galaxy charger, its output is 9.0V = 1.57A which is for fast charging (correct me if I'm wrong) and thus won't handshake with the Vita so won't supply ...
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4answers
153 views

What's the difference between 18 A & 18 Ah on a Battery

What's the difference between 18 A & 18 Ah on a 12 V Battery
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87 views

How can I test battery amps and Ah?

I have a laptop battery taken apart. The battery should last over 2 hours on my laptop but it's barely lasting 15 minutes so I'm trying to work out why, while also learning along the way as I'm just ...
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If there are more capacitors, are there more amperes?

I'm really new to electronics, and I'm wondering if adding a capacitor increases the output current. I have the following questions: Say for example, I have a 5V 1.0A Source, does the output current ...
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86 views

Relation between Amps and Thickness of wires

I have some questions that have been bugging me for the past few days, and I am here in hope of some help. My Understanding of how battery works: "The battery (say 9V DC) does not store charge, it ...
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75 views

Create my own battery for my electric bike [closed]

I was wondering if it's possible to avoid buying a $400 48V 15Ah battery with an output of 54.6V and 2A, and instead make one by joining multiple 3.7V 5Ah batteries in series and or in parallel? Is a ...
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2answers
173 views

I don't fully understand Amps

I am a hobbist in electronics, meaning I don't have any really training on electronics. Anything I know about electronics is read from books, YouTube or this site. I am trying to design a circuit ...
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55 views

How can I interpret the readings of a USB voltage tester considering the input voltage is 5V and I am charging a 3.7V battery?

I have this USB voltage tester that I place between my usb wall charger and a USB charging cable. This device gives me the total current that went through over a period of time. Let's say after 2.5h ...