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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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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
27 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
44 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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43 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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Understanding loads on panel board schedules

I need help understanding why loads are divided by phase on panel board schedules, when the current travels through all of the phases connected to a load. I’m going to try to explain it as best as I ...
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1answer
51 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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34 views

Will I have issues with this circuit? [duplicate]

I have got a setup with a 500 W ATX PSU attached to a breakout board to provide a terminal output and switch to kickstart it. I want to attach the 12 V output to a galvanometer circuit I got from ...
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33 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 ...
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1answer
40 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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93 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
50 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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1answer
42 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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2answers
116 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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2answers
49 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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1answer
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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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1answer
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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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1answer
47 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
47 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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3answers
135 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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2answers
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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
145 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
23 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
185 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
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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
128 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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0answers
80 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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2answers
118 views

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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1answer
77 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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1answer
71 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
171 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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1answer
52 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 ...
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1answer
1k views

Motor current consumption and power do not match

I am working on a design and need to calculate the energy consumption of this motor: https://www.maxonmotor.com/medias/sys_master/root/8825428410398/17-EN-256.pdf. (Part No. 339252) The ...
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4answers
129 views

I want to draw 20 amps from my home power outlet is there any way to do that safely?

I'm wanting connect up a bunch of Raspberry Pis (micro computers) to one power outlet in my home. At about .5 amps per computer * 40 computer means I will need to draw 20 amps. Now, I know that I'...
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1answer
57 views

Ammeter for 24V power that can be read by a Raspberry Pi?

I have a project I'm trying to design and build that involves a "more accurate/useful" battery gauge for an electric scooter. The scooter runs on 24V off of two AGM cells in series. The details of the ...
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1answer
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Totally noob here,help me choosing the best method of powering led

First of all im sorry for the grammar because english is not my 1st language,so bear with me. So im trying to power up 100 0603 red smd led,its a generic brand and all data i could gather was its 1.8 ...
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1answer
72 views

Measured amperage differs greatly from my math

I've got the following circuit: simulate this circuit – Schematic created using CircuitLab It works. The LED glows nice and bright. However my math doesn't match the readings I'm getting from ...
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1answer
158 views

how to reduce current without changing voltage? [duplicate]

In my car there is a charger it is producing 5v/2amps,but there is a clock in my car, this clock is connected to this car charger it need only 5v/500ma,how can i reduce the current to this clock?
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38 views

KUKA LBR iiwa Robot_Reducing the carried amperage by merging wires

Based on KUKA IIWA specification I can connect an 8A power supply to X651 (input) which is connected to two outputs (X36 and X32). Each output can provide (Max) 4A. My problem is that I need to power ...
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3answers
120 views

how do electrical arcs occur?

I was under the impression that arcs form due to high voltage, that the breakdown of air was typically 3 million volts per meter. However, arc furnaces typically use low voltages, around 30 to 40 ...
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an arc at what amperage/AC voltage would be at a sufficient temperature to melt most common metals?

I have come across a video recently (link below) that uses two microwave transformers to step down voltage from a wall outlet to be used to melt metal as an electric arc furnace. However, he neglected ...
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1answer
57 views

dangers of building electrical arc furnace

I am currently rewinding 2 microwave transformers to create an electrical arc furnace. I have taken the secondary coils out of each transformer and am planning on winding new ones. In theory the ...
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2answers
83 views

Test current capability of a 24V 15A power supply

I have a power supply from a broken 3d printer. I want to test if it is still okay. It is specified as 24V, 15A (360 W). It is giving me perfect 24V at idle, but I wanted to test if it is still ...
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3answers
235 views

Solid state relay voltage current rating

I am looking to use a solid state relay like this one . This relay has a peak load voltage of 350v and continuous dc current rating of 110mA. My question - if I wanted to control 12v @ 1A DC through ...
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7answers
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12 V car battery short circuit with a wrench that has resistance of 0.5 ohms, how much current?

ANSWER/ERROR FOUND: resistance of the leads of the multi-meter is the culprit. The true resistance of the wrench cannot be measured using a basic multimeter. The resistance of the wrench is more so ...
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1answer
80 views

How much current is drawn by an 18,600 BTU A/C compressor during free run?

I recently got an old hermetic A/C compressor. I plan to use this as a vacuum pump mostly for some of my hobby projects. The specs on the label on the A/C said that it power draw is 2450 Watts, 11....
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1answer
45 views

How to Calculate Appropriate Load Required When Converting Voltages?

I have a cabinet with a power strip with various devices being powered: RaspberryPI (5V / 2.5A) x2 Mini Smart Router (5V/1A) TP-Link Switch (9V/0.6A) USFF Computers (19V/7.1A) x2 I've been ...
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2answers
46 views

Can I use a DC power pack (12dcv 3a) with an inline connector rated at 24dcv 2a?

I have a power pack that is 12v 3a, I want to buy an inline switch so it can be turned off without having to unplug it. The following image is of the inline switch. It is rated for 24v at 2amp. If my ...
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3answers
93 views

What happens when Amperes hour (Ah) and voltage regulation go together to the party?

This is the first time I ask on the Electrical Engineering site of Stack Exchange, please feel free to dismember my question. Please take into account: I am thinking about the hypothetical ideal case ...