Questions tagged [current]

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

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How to solve for \$i\$ using superposition?

Second semester college student. But I'm actually confused on how I'm supposed to do this. I know that I need to find \$i\$ values on each voltage and current. a. 12 V on, 3 mA and 9 mA off. (\$i1\$)...
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How to increase current by reducing voltage? [closed]

I have a 400kv HV generator of 500 mA , but I want to increase the current by 10 time or more by reducing less voltage as possible/sufficient , help
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Determining if a multimeter will damage ICs - How to confirm?

I’m looking for a straightforward way to determine if a particular multimeter will damage sensitive electronics such as ICs. Specifically, let’s say I have a Fluke 117 multimeter and I am trying to ...
KRitiCal_m4ss's user avatar
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How to ensure the current passes through decoupling capacitor?

I am familiar with adding decoupling capacitors to protect input power pins of chips on PCBAs, as well as output power pins of voltage converters. Still, there is something I am not sure of. Below are ...
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Can I modify this AC/AC SSR module to allow it be connected in series with a load at its control pins?

This is a follow-up to my question at: Can I wire an AC/AC SSR input control pins in series with a load? I have this AC/AC SSR module (Fotek SSR-10AA - schematics and pictures added) and I'd like to ...
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Current draw limiting to under 10 A [closed]

I'm trying to run an unknown amperage motor off of a 10 A Li-po battery (I have two of these batteries), and from what I'm seeing from testing is that it might try to draw more than 10 A. If the motor ...
Michael Johnson's user avatar
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dual power supply - digital line current limiting

I am connecting the transceiver chip to the PIC16 MCU and is going to power them from different switching power supplies, originating at same power source. Both power supplies output 3.3V, thus ...
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Delta star transformation/ find branch current

what is the best way to determine the current i3 and i6 in this circuit? I tried to do a star-delta transformation. Unfortunately, I "lost" the current i3. The values ​​can be seen in the ...
Omar's user avatar
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Can I wire an AC/AC SSR input control pins in series with a load?

Is there a way for an AC/AC SSR to trigger when current flows between its input contacts? I mean, instead of wiring N and L from the outlet directly into its input contacts (with a switch,) I’d like ...
Rodrigo's user avatar
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How to Power 2 MG996R Tower Pro Servo

I tried powering a MG996R Tower Pro (180 deg metal gear) servo from an Arduino UNO and ended up hibernating the host PC. I want to power two such motors (in parallel configuration) for 10 minutes a ...
Aditya Jain's user avatar
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How can a current probe avoid saturation?

It is a buck converter, And I want to know how current probe can avoid saturation. Turns ratio is 1:1000. And DC makes transformer saturation. So... How can probe avoid saturation?
cocoromina's user avatar
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LEDs forward voltage at minimum brightness

I have a design issue. My circuit connects its MCU 5 V supply to two of these green LEDs in series with a 170 Ω current limiting resistor. I'm stuck with using two of the LEDs in series. I don't need ...
Citi's user avatar
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What is the quiescent current in a current limiting voltage regulator circuit?

Is the quiescent current simply the current drawn by Q1 and Rin when no load is connected to the output? How would this differ from the supply current?
user998479's user avatar
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is Vov of a nMos always VGS - Vt?

Looking at this graph from Analog Circuit Design Discrete and Integrated by Sergio Franco, is it always true that Vov = VGS - Vt? or is this only true at pinchoff point?
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Does current mode control for dc/dc conv imply a constant current output?

I am getting very confused, I have read articles about current mode and voltage mode control, and it seems that most converters use current mode control - which seems has two nested control loops. The ...
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Finding the velocity and current on a 'moving' resistor [closed]

I came across this example which to me looks kind of non-sensical. I think the Hall effect is supposed to be used to help solve this, but I struggle to use it as I think that there is some information ...
Vuko Mijušković's user avatar
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1 answer
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Undercurrent E-stop [closed]

what would be the effects of an emergency stop button rated significantly lower than the system's current draw? Say for example, an e-stop rated for 10A DC in a system pulling 20A DC. Would the e-stop ...
WafflesAndEggs11's user avatar
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IV curves of solar cells in parallel and series

When 2 solar cells are in parallel, is it that the final IV curve is the simple addition of Currents (for same voltage) of both individual IV curves ? My main doubt is what happens in 2nd and 4th ...
Nikhil Kumar's user avatar
1 vote
1 answer
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How much current can I pull out of a battery

So I know an average PP3 9-volt battery has about 500mAh of capacity. If I wanted to, for example, draw 3.5 amps, the battery would last about 8 or 9 minutes, though that would be assuming the battery ...
Ombrezz's user avatar
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ATmega 328P system reseting [closed]

I am working on an electronic system for irrigation. The system works well when I am using separate power supplies for the circuit and the 5 V relay. When I use a common 12 V power supply for both, ...
nad66's user avatar
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Intrinsic current of the diode, what is its current?

I'm having some difficulty finding the diode's intrinsic current, I applied some formulas, but I don't know if it's correct. Could anyone tell me if this is correct or why it is wrong? If this is ...
LUFER's user avatar
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How to calculate the power draw and current draw of a PCB

I have a PCB my team designed that is based on an Adafruit board (Feather M0 LoRa), makes use of several breakout boards (temp sensor, IMU, etc.), and has various other components such as LEDs, ...
bimmui's user avatar
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How to find current consumption of IC from datasheet?

How do we find out the current consumption of TCAN33x family ICs from the datasheet? I am creating a power tree diagram for my project. For that, I need to find the current consumption of each IC But ...
Monesh Rathod's user avatar
1 vote
2 answers
231 views

How to calculate current sharing between two different voltage souces in a parallel circuit?

In a parallel circuit consisting of a 14V, 150A alternator maintaining a fully charged 12V, 800 CCA battery - How do I calculate how much current the alternator provides and how much current the ...
stumblebee's user avatar
2 votes
1 answer
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Detecting a very low current vs open wire [closed]

I am working with a few 0.333V CT and at times, the operating current is very very very low, near 0. I need to be able to detect between a very low amp reading vs an open wire. Is there a way to do ...
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Resistance and current of IO pins

I am using a STM32F103C8T6 MCU to control a DRV8825 chip and it just occurred to me that I never considered how much current goes from the pin of the MCU to the pin of whatever chip I am using. For ...
Lucas Jiang's user avatar
1 vote
7 answers
191 views

Why is it said that inductors block AC?

I have understood the concept that a capacitor blocks DC and allows AC, but how does an inductor block AC? Suppose I connect the inductor in an AC circuit. I am still able to read the current at the ...
Curious_guy's user avatar
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Par control in DC servomotor

How can I control the torque of a DC servo? Servo model: DS51150-180 https://i.ebayimg.com/images/g/pEkAAOSwmFNl4NkA/s-l1600.jpg The current in a DC motor, as well as in a servo, determines the ...
Gael Alejandro's user avatar
2 votes
2 answers
178 views

Overcurrent LED in LM338 circuit

I have an LM338 set up in current regulation mode, and I want to make an LED turn on when the current is maxed out (4A in this case) Where do I put this LED, and what other circuitry do I need? Is it ...
Klumpy7's user avatar
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uA741 OpAmp output current never approaches "TYP" output short circuit current

I am trying to use a uA741 Op-Amp (I cannot use a different Op-Amp) to build an amplified half wave rectifier circuit. I was able to successfully build the circuit, however the zener diode that I used ...
Samantha Garcia's user avatar
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2 answers
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What is the output current of MAX4238ASA+?

I was reading Analog Devices MAX4238ASA+ datasheet, but I didn't find the output current to know which ADC I can put after it. What is the maximum current in normal use?
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Op-Amp Selection for Dummies

I am new to op amps, and I could use some help. I am trying to make a linear precision current supply and searching for the perfect op amp for the job. I have a design I know that works, at least on ...
Dereck's user avatar
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How can I calculate an average value of specific inductor current? [closed]

There is a inductance current signal in below. I want to calculate the average value of the current. Possitive peak value is 33.4 A Negative peak value is -20 A Peak to peak time is 36 µs. But I do ...
Mr.JuniorEngineer's user avatar
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3 answers
56 views

Norton equivalent circuit

I tried to solve the problem below but I don’t know if it’s right.  Im finding I2 or the current when SW1 is open. I put a test voltage 1V between the nodes of 8 ohm and 6 ohm resistors so its in ...
mama b's user avatar
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2 votes
4 answers
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Solving differential equation for an RL circuit

Suppose we have an RL circuit as given above. I would like to find \$i(t)\$ using the following method but I can't find my mistake. I know how to find \$i(t)\$ using different methods/ways, but I just ...
Lars Smith's user avatar
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1 answer
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Dimmer + LED light bulb + resistor = Ohm's Law Broken

CIRCUIT: A 12 volt battery powers a dimmer. The output of the dimmer powers 4 LED light bulbs. They are all in parallel: 6W + 2W + 2W + 2W. The 6W bulb is a spotlight. The 2W light bulbs are under ...
rstross's user avatar
8 votes
4 answers
1k views

I do not understand behavior of current in 74HC4066

From the Nexperia 74HC4066 datasheet, page 4, table 4, footnote 1, what does it mean: To avoid drawing VCC current out of terminal Z, when switch current flows in terminals Yn, the voltage drop ...
agusha's user avatar
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-3 votes
1 answer
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Same power in the circuit comparison [closed]

I have 2 circuits with the same power (900W), could anyone please explain the big different between these two? Circuit one has 30V, 1 Ohm, 30A and 900W of power. Circuit 2 100V, 11 ohms, 9,09A, 900-...
Ybx Nop's user avatar
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15 votes
3 answers
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Why does an inductor's inductance decrease with current?

I am struggling to understand what seems like a fundamental behavior of an inductor. I am looking at a chip mount LQM18PN2R2MFR inductor. One of the diagrams on the manufacturer's website shows a ...
tronhawk's user avatar
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1 vote
2 answers
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What is the equivalent AWG of 1/4 inch soft copper tubing?

Out of curiosity, what is the equivalent AWG of 1/4 inch copper tubing? The tubing would be mostly hollow; how much current would it be rated for?
0x6869's user avatar
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0 answers
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Need more positive than negative current

My power supply collapses due to uneven positive and negative current draws. I need about 2A of +12VDC, 1A of +9VDC, and 0.5-1A of -12VDC in a design I’m working on. I’d like to avoid using multiple ...
Axemurder1's user avatar
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Does a negative base current in BJT npn mean that the operation mode is Reverse Active?

Given Vce = 2V, Ic = 1.7mA, and Ie = 1.6 mA, I used KCL to determine that Ib = -0.1 mA. Does this mean that the BJT npn is in reverse active mode?
user364328's user avatar
-1 votes
4 answers
56 views

Relation between power, voltage and current [closed]

I just started work in an industrial food manufacturing company, and they ask me what will happen to current if voltage increases in an industrial setting. I answer with OHM's law which state that ...
Carlo S's user avatar
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0 answers
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When I hold a stepper motor while it is operating, what happens? Does it draw more current or maybe reverse current?

I was wondering how stepper motors of 3D printers work and I found that some of them does not have a calibrating mechanism like a switch or whatsoever. It seems like there is an internal thing that is ...
Abdulrahman Abdulkhalek's user avatar
2 votes
1 answer
54 views

Managing Ground Return for High Surge Currents in LED Capacitor Discharge Circuit

I have a use-case in which I require four bulk capacitors (470uF) charged to 6.4V. Each separate bulk capacitor will be used to provide the necessary energy to pulse a string of three LEDs at 5μs ...
NickRand's user avatar
0 votes
1 answer
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Using 20 A with a slip ring, is it better to go for more channels for redundancy, higher amps to stop maximum load, or both? [closed]

I'm planning on designing a power strip with the use of a slip ring. The maximum ampre I would be output is 20A to a minimum of 2.5A. I've found some slip rings on Aliexpress that are 20A across 3 ...
Dragonfly3r's user avatar
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2 answers
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Common collector amplifier gives much less voltage than expected?

Common collector amplifier gives a good current gain and there is a link on internet, that makes the calculation for current amplification automatically. http://www.vk2zay.net/calculators/transistors/...
lastime's user avatar
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5 votes
6 answers
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How can current phase shift be 90 degrees behind voltage just "inside the capacitor" on an RC series circuit but be in phase in the resistor?

Imagine an AC source in series with an RC circuit. In this video, the instructor claims current will be 90 degrees behind voltage inside the capacitor but not inside the resistor or the whole circuit. ...
Duck's user avatar
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0 votes
2 answers
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Capacitor Voltage in Hodgkin Huxley model

Skipping the whole discussion of the Hodgkin Huxley model (in the biomedical-neuronal domain), I have problems understanding the last step of this calculation (in pink): Can anyone explain the ...
KaleM's user avatar
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Why is ds = p*dp*dΦ and not ds = dp*dΦ?

The problem I am having is with ds. I understand the two integral bounds, which are the radius and the 2pi boundary for the circle. It also makes sense with the units to integrate twice to eliminate ...
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