Flow of electric charge - typically movement of charge carriers, such as electrons. Measured in amperes (A).

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12 views

Increasing Terminal Block Rating by Combining Contacts

I understand that by using multiple wires, we could increase the surface area of the conductor and thus, allowing more current to pass from one point to another. Does that apply to contacts on ...
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1answer
23 views

Question about transformer current

I got Step down transformer which reduces voltage from 230 VAC to 40 VAC ~ 100 amp. I can weld with it while having no problems. Also I got another one step down transformer which is three phase, but ...
0
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0answers
24 views

Operational Transconductance Amplifier Input Configurations

I recently purchased several OTAs (Lm13700) but have had quite a bit of trouble using them. Going through the TI datasheet and a Nuts & Volts tutorial it's occured to me that transconductance amps ...
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2answers
46 views

Total current at the load?

Assume the voltages sources(InducedV1/V2/V3) are created by an inductor/or a strong magnetic field changing rapidly(or in anyway) the PS would power the load, however, there are induced-EMF's V1 in ...
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2answers
64 views

Will current flow beyond the diode?

V2 is blocking any current passing diode(1) because of the voltage being higher,however, V3 is equal and opposing V2, therefore canceling out and allowing current flow through the diode? ...
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0answers
48 views

RF VCO not O-ing

I am trying to set up this VCO: http://www.crystek.com/microwave/admin/webapps/welcome/files/vco/CVCO55CL-0600-0880.pdf I have connected it to two variable DC power supplies, a 5V at Vcc and a 1V at ...
0
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3answers
134 views

Current decreases while reading

I'm a bit confused about reading current on a breadboard using a multimeter (I'm a complete beginner with electronics). I'm using a self-powered breadboard which should deliver 5V / 1A. Multimeter is ...
2
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2answers
57 views

How does Stitching capacitor provide shortest return current path between plane splits, as we know that it blocks DC current?

I heard that Stitching capacitors are used to provide shortest return path whenever a signal is routed along the 2 power plane splits. As we know the return current path will be right under the trace. ...
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1answer
26 views

Delayed Overcurrent Protection

I trying to find a solution for a problem that I have with a system I am responsible for. The system runs on radio control, the problem we had is one of the radios got stuck on transmit and blocked up ...
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1answer
61 views

Can a resistor create current?

Say I have a boost converter, and the boost converter is outputting 5vdc, but it's not outputting the current or Amperage that I want it to output. Could I put a single resistor before my load, say a ...
0
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1answer
59 views

Taking an unstable DC voltage, and stabilizing it

I have a DC motor generator (basically the motor spins, and it powers an LED at the moment), and the output current (mAh) and voltage (V) is very unstable. The goal is for the entire circuit to run ...
0
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1answer
52 views

How will I get the per-unit parameters when the data from the short-circuit test are shady?

Data from short-circuit and open-circuit tests of a 60-Hz, 100-kVA, 4600–230-V transformer are: VOC = 230 V IOC = 14 A POC = 60 W VSC = 172.3 V ISC = 20.2 A PSC = 1046 W Get ...
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1answer
44 views

What does “Maximum Input Current” in a data sheet mean?

For example, in the datasheet of ATS030A0X3-SRPHZ, what does the maximum input current mean? Does it mean... 1) This is how much you are allowed to feed into the voltage translator (presumably using ...
-2
votes
1answer
32 views

Detection human body and electronic devices

I have watched a video of Brio. What you think about it? Is it only applicable to lamps? How does it work? It seems that 24VDC charges doesn't flow on human skin, but devices with input capacitor ...
1
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1answer
284 views

Maximum current capacity of this wire?

I couldn't figure out the maximum amount of continuous current can a 4 meter 0.085 Ohm wire carry? Also, for 300 milliseconds can it handle 100Amps? Provided a powerful fan cooling it? What about ...
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2answers
96 views

6A Current Source [closed]

Hi I am designing a 6A current source. I know how to design a current source I am just looking for suggested materials that can handle the full 6A. The op amps and transistors that I have now are more ...
0
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2answers
41 views

TL074 or TL072 VOL (output voltage swing low)?

TL074 or TL072 VOL (output voltage swing low)? I can't find it in any datasheet. I want to know how low the output can get if Vdd=9V and Vss=ground (0V). If I read the datasheet right, VOH (output ...
1
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1answer
48 views

Differential gain of amplifier with current mirror

Consider this pdf document, pages 58-59-60. It is a differential amplifier with a current mirror as active load. According to that document, if I take the unbalanced output in the right-hand branch ...
3
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2answers
72 views

Please explain the circuit (current regulator test circuit with Zener diode)

my mind needs refreshing so could someone please help explaining analysis of this circuit. It is used for testing a current regulator (LED driver circuit) ('I' in the image). The regulator current is ...
14
votes
3answers
2k views

Why does a sweaty finger neutralise the touch-sensor on my phone screen?

My experience is that when I'm running, my fingers "don't work" on my phone screen. My understanding was that the sensor on a touch screen works on static-charge, ie that you act as an 'earth' to ...
3
votes
2answers
147 views

How to limit current precisely?

I would like a way to limit the current of a circuit to exactly 100mA (+/- 2-5%). This is on a relatively high voltage circuit (100V to ground), and the current is normally pulsed with pretty fast ...
0
votes
1answer
51 views

Powerstrip's red indicator is flickering like crazy as long as no light is turned on in the room

I have a Belkin power strip with a red light indicator in it. I have used it for years and it functioned properly. Last night I noticed its red light flickering like crazy, i.e. constantly turning off ...
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2answers
303 views

what is the current limit through a trace?

Similar questions and topics have been asked before such as Standard PCB trace widths? Formula for voltage drop vs PCB trace width, temperature, current, and trace length I've used PCB Toolkit in ...
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vote
2answers
73 views

Resistor For Maxiumun Water Electrolysis

I've partaken in an experiment where I am looking to create the most efficient way to conduct water electrolysis. My only need is that I don't trip a breaker. I will be running at 120vac, and likely ...
2
votes
1answer
49 views

Meaning of AC15, DC1, AC1, and DC13 in relay durability curves

In the datasheet of the relay OMRO G7SA from the durability curve they specify the number of operations as a function of the contact current. Each curve is for a specific current and voltage. The ...
0
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1answer
46 views

Difference between a series circuit or parallel circuit in power generation?

I wanted to know the difference between the induced-EMF and current, in a series circuit layout, vs a parallel circuit layout. In a series the current would stay the same,however, the induced-EMF ...
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0answers
67 views

Can't figure out circuit analysis

The original homework problem is as follows: I have the solution from the professor, but I don't understand why he rewrites the model the way he does, and I also don't understand the derivation of ...
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1answer
44 views

Variable Current Lead Acid Battery Charging

I'm designing a solar controller in order to charge SLA batteries. I did some research on dedicated ICs that act as controllers, and found that most implement some sort of MPPT, in order to extract ...
0
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0answers
25 views

Mesh analysis confusion — resistor polarity

I used mesh analysis to find Vo in the figure below. However, my set of equations just end up cancelling each other when I do the math. I am also not sure if the polarity of the resistors changes ...
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0answers
20 views

Testing conductivity strength of magnesium anodes in different weights

I work for a tracer wire manufacturer for the underground non-metallic pipe utility sector, natural gas, water, sewer and telecom. We use magnesium anodes for grounding out the far end of the tracer ...
0
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0answers
45 views

wireless mobile charger Proteus Simulation

Im trying to make a wireless mobile charger and before building it im trying to simulate it on proteus but the problem is in the circuit i have attached a current probe before my primary coil and ...
0
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3answers
35 views

Why does switch change parallel current after junction?

This is an image demonstrating the use of a pull up resistor. I've just started studying electronics and have been learning about ohm's law. Ohm's law says that current within a circuit is equal to ...
0
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2answers
41 views

Potentiometer with No Minimum Resistance

I'm looking to create a variable current regulator with the LM317 using 1-turn pots. I know that I am going to need to have a resistance of 1.25 Ohms to have a current of 1A, which I want to be my ...
0
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1answer
32 views

Using the ACS712 and Arduino to measure RMS Current (220v mains)

I bought the common board that is based on ACS712 . My objective is to measure the current (and if possible, also the voltage) of my Mains WITHOUT any additional circuitry . After doing a bit of ...
0
votes
1answer
62 views

Exceeding voltage ratings on microcontroller pins using series resistor

I've been designing a circuit which requires a microcontroller to read a voltage above its current VDD or below its current VSS. I've done this once or twice before by putting a large-ish resistor in ...
0
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4answers
73 views

Max potential difference that can be created in an analog signal using a microphone

I am a total newbie. The main idea behind all this is that microphone produces analog signals which are fluctuation in Voltage.. So can I use an amplifier to amplify these Voltage? And after it can ...
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1answer
47 views

How does switch interfacing work?

This is a basic question, but I don't have a background in electronics so I find it difficult to wrap my head around the concept of how current flows. I have chosen this simple example of interfacing ...
5
votes
1answer
69 views

Electric shock from laptop due to capacitive coupling?

If a person touches an exposed wire (the wire has a ground-prong) on the 20V side of a power cable while barefoot, I heard that it is possible to receive a shock of higher than 20V due to capacitive ...
0
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1answer
29 views

would this be safe to control servo with usb

i've been asking around and people has been telling me that the max current a usb can supply is 100 ma then 200 ma then 500ma then the http://en.wikipedia.org/wiki/USB says 0.5–0.9 A (general) 5 A ...
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0answers
7 views

water heater cause electric system failure [migrated]

My water heater, a Styleboiler VF 100 SE (1200W), has never had any problem. Recently I bought an electricity timer plug (up to 3500W) to put its plug into, in order to dose the amount of electricity ...
0
votes
1answer
61 views

Is this SSR design recommended?

I want a hard power switch for some battery-powered BLDC motors, but the currents (5A, up to 20A transients) and voltages (up to 60V) limit the kinds of switches I can use. Because I want some small ...
1
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0answers
45 views

Why do some Arduino relay modules can handle up to 250 VAC but not above 30 VDC? [duplicate]

When you look for "Arduino relay module"s, you usually see one form "SONGLE" that says on it: 10A 250 VAC 10A 125 VAC 10A 30 VDC 10A 28 VDC My ...
0
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3answers
70 views

Resistor/Ohm's law question?

I just used Ohm's law and I was puzzled by this. I am quite new to resistors, and I am only going to use it for an Ionocraft project to reduce the flow of current to ground. So if I have a 9v ...
0
votes
1answer
40 views

How to estimate motor current under load

How do you estimate the average current under a typical load of a brushed DC motor? I'm trying to size the right motor, motor driver and battery to propel a small two-wheeled platform using this ...
0
votes
3answers
98 views

Why is DC Voltage called Direct Current ?

I have had this question since a long time, and didn't find any other place to ask this. So thought will just ask here. The "DC" in DC Voltage/Supplies stands for Direct Current. So why is it ...
0
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1answer
32 views

Partial load failure detection circuit

I'm working on the power supply of a temperature controller which sends about 5kW of power maximum (230VAC 50Hz) into 3 sets of 12 heaters (actually, 3kW + 1kW + 1kW). I'm at the stage where I need to ...
0
votes
1answer
47 views

6w 12v 5a peltier only drawing 1a, I am supplying more current but its only drawing 1 amp?

I just bought the peltier and its of 60 watt 12v 5a and its maximum capacity is of 90 watt power. I am using my Pc power supply which have ability to provide 12v and 15a maximum. I connect to that ...
1
vote
0answers
34 views

Correctly Using ACS712 hooked to a microcontroller

I am making a project that involves AC current measurement from the Mains. I have done a bit of research and have found that the ACS712 can do this. I would like to know the correct way of using ...
2
votes
2answers
58 views

Replace transformer with PWM control

This is my first question on stackexchange so if I do anything wrong, please let me know :-) So my situation is the following: I am working on a power supply module where I need 7 separated +28V DC ...
0
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0answers
57 views

Do we ever need to use multimeter's transistor current gain measurement feature?

Many cheap multimeter have this feature that they can measure the hfe of a NPN or PNP transistor. Does anyone ever need to use it? I mean, when we design something using discrete transistors, we look ...