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Questions tagged [current]

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

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Current Transducer Usage

I'm just a bit confused about this current transducer/sensor https://uk.rs-online.com/web/p/current-transducers/1383472/ Datasheet: https://docs-emea.rs-online.com/webdocs/15c5/0900766b815c5532.pdf ...
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48 views

Electrical question - trouble with midget connector [on hold]

I own a bucket truck and so I got into there to install my midget connector. It's just a limited space there where I need to work. So I climbed up there, got my pigtail wires out and I used my bull ...
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2answers
36 views

Difference between input current and supply current?

I am reading and trying to understand datasheet of ICs. I am reading this datasheet now : http://www.ti.com/lit/ds/symlink/sn74hc00.pdf In the table 6.5, there are two parameters namely Ii and Icc. ...
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14 views

Heathkit IP-27 bench PSU min. stays at 0.18V and there is a +0.1V for all the readings?

I've recently acquired a Heathkit IP-27 bench power supply. The supply itself works quite fine except that the minimum voltage it can be turned down to with the coarse adjustment is only 0.18V, doesn'...
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1answer
56 views

Output problems with lm124 opamp

I am using this circuit to supply current through R1 which is a 50Ohm coil. Opamp is Lm124 supplied as shown in the schematic. Vin is a voltage that can be between 2.5V and 3.5V. Everything works fine ...
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0answers
36 views

Neon Bulb Hold Voltage and Current

I'm trying to modify a neon bulb spice model to simulate a plasma chamber. I've calculated the strike voltage (Vstrike) using Paschens law but I haven't been able to find out what the hold voltage/...
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2answers
79 views

how to determine the current in this circuit

After calculating total resistance and total current, I am applying current division and I obtain (6/6+6)*1A = 1/2 A. But in the answer key it is presented as 1/3 A. What am I doing wrong?
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1answer
85 views

why current flow through ground wires of submersible 3 phase motor?

I have a 150 KW 3-phase submersible motor with 2 cables. Each cable is (3p + 1 ground). When connected the 2 ground wires at the same point, I read about 15 A on the ground cable. Why current flow ...
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2answers
40 views

Nodal question with current-controlled voltage source connected to independent voltage source

so i've got a question here the question is to calculate v1 & iΦ, of course for nodal analysis (v1/24) + ((v1-(60+6iΦ))/3) + ((v1-va)/2) = 0, but (with va as the node left of 2 ohm resistor) how ...
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3answers
43 views

Can MOSFET drain current be higher than rated if the drain-source voltage is below rating?

Sorry, a very noobish question here. I'm trying to understand if MOSFET ratings work on the principle that current and voltage are proportional (like Watts) or whether each rating is separate and ...
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1answer
53 views

Is my understanding of this level shifter correct

I am considering using this TI LSF0102 level shifter in my circuit - but would like to understand, based upon its datasheet, if I have my understanding correct. It says it has a 100mA current rating, ...
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21 views

Graphene yarn used in stator design [on hold]

Can a current be induced in graphene yarn if used in a stator to replace the copper windings?
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1answer
68 views

What would the maximum current draw for this chip be?

I am looking at using this logic switch in my circuit: https://www.onsemi.com/pub/Collateral/FSTD16211-D.pdf Looking at the datasheet I am finding it hard to figure out what the maximum current draw ...
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0answers
32 views

What would be a good constant source of power for a motor? [on hold]

A couple of friends and i want to build an orrery. We are having trouble in figuring out what would be a good power source for our motor. We are planning to use one motor to run the central gear ...
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2answers
62 views

What is the turn-on and turn-off condition of the npn-transistor?

Following is the circuit I have been analyzing. My intention is to calculate the turn on and off condition of the transistor Q1. R1 and R2 (10 kΩ each) are internal to the transistor. simulate this ...
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2answers
85 views

Designing a circuit that opens when less than 12 volts are applied and closes when more than 12 are applied

I'm looking to build a circuit where current only flows when there is a potential difference across the entire circuit of more than 12 volts (+- 0.1 V). I also need there to be only a small amount of ...
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2answers
67 views

Vampire power a.k.a Standby Power

What is the use of Vampire Power. Does it do any good?
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2answers
41 views

Path of current and equivalent resistance

In this circuit, the current can flow from node 1 to node 2 through two different paths i.e either thorugh R2 or (R1+R4). Since the current selects the easier path I expect the current to flow from R2 ...
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3answers
156 views

Why is current controlled feedback faster than voltage controlled feedback in PWM controllers?

Looking at modern ICs, we prefer current control feedback over voltage control feedback, due to the speed of the feedback. Current control will react faster than voltage control. Here are 2 images, ...
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6answers
139 views

What is harmful for electronic circuits? Voltage or electrical current?

Its said that if you get more electric current, the electronic device in a circuit will just take what it needs and its not dangerous, so if we raise the voltage and therefore the electric current ...
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0answers
29 views

TPS562208DDCT current problem

I have attached a PSU design which I have created. The input voltage is between 12 and 24V DC. The first stage creates an isolated output voltage of 7V that is then fed into the two TPS562208DDCT (...
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2answers
99 views

Troubleshooting defective LED bulbs

I bought 10 Thomas Watt LED bulbs and 8 are dead in less than a year (each last about 2-3 months). Soometimes a couple of days before they stop working, they flicker when I switch them on or after ...
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3answers
71 views

Stall current calculation for DC motor

I'm trying to calculate the stall current for a 12 V DC gear motor (919D1481): No load speed = 15800 RPM No load current = 0.52 A Nominal speed = 13360 RPM Nominal current = 2.85 A ...
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3answers
135 views

Confusion of how current can flow in a 1+ henry LR circuit

I'm trying to understand how current actually flows in a circuit where you have a 1 Henry or greater inductor in it. I understand that the voltage across the inductor is ...
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3answers
52 views

why would Ix would be 0?

Current coming out of the 5V source would never be 0 so what would make the current coming out of the 3v dependent source 0?
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2answers
398 views

A question about electrons, charges and current

Let's talk about DC, a very simple circuit: a light bulb and a battery. Some authors say that electrons move from negative to positive and current from positive from negative. I always thought ...
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2answers
89 views

DC current gain in complementary transistors

In Class-B amplifiers complementary PNP-NPN transistors are used, e.g. TIP2955 and TIP3055. https://www.electronics-tutorials.ws/transistor/tran_3.html says that They both have a DC current gain, ...
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1answer
20 views

Xbee Explorer Regulated (WRL-11373) - Current draw

Can anyone tell me roughly how much current the WRL-11373 draws? I've googled and looked on Sparkfun but can't find any info on it. It says here that the max supply current is 500 mA.
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1answer
283 views

(Textbook error?) Nyquist's relation: telegraph speed of transmission

An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following: In 1917, Harry Nyquist came to the American Telephone and Telegraph Company immediately ...
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3answers
39 views

Current Rating of JST connector PER PIN

Hi, I'm just wondering about the current rating of the JST-XH and JST-VH connectors PER pin. For example, in the XH connector above, ** it says 3A current rating, is that split between all pins or ...
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3answers
486 views

What is the value of the current (i) and what is the right way to do it? [duplicate]

What exactly went wrong with the below method? Here, in the same circuit I am getting a different value for the current in the mid wire only by rearranging the circuit. I was trying to solve this ...
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2answers
34 views

Run actuator at higher voltage and with lower dutycycles

I have an actuator which is rated at 12 VDC input voltage (0-15) with a maximum allowed duty cycle of 20%. The already existing voltage levels in my system are 5V and 22V, and since I am weight ...
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0answers
40 views

Off load voltage in npn transistor as a switch

There is transistor tutorial on sparkfun.com (https://learn.sparkfun.com/tutorials/transistors/all). I am wondering why there is 1.3 V drop depicted across the LED1 on the picture, since when the base ...
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1answer
72 views

Ampere requirements [duplicate]

I read question from someone who was having monitor with 90 W power, 19 V and 3.32 A rating. When calculated using volt and power the amp came out to be 4.74 A. I didn't understand why is there ...
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5answers
115 views

How is electricity wasted?

All i know is electric current travels in a loop. So how / where in its way does electricity (electric energy) get wasted? And what do we do on switching electric appliances off? If it's not electric ...
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0answers
40 views

JFET Voltage Divider design question

I've been trying to get this question done for a couple of days now and no matter how much I try I've been unable to get it done. Your help in this question is greatly appreciated.
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1answer
48 views

9V Battery Current Range

What is the range of currents that I can safely draw out of a 9V battery without damaging it? I am planning to design an experiment and I don't want to draw too much of current out of a battery and ...
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3answers
105 views

Power of the Zener diode

In this circuit there are several things required like the inductor and diode current, and the average power of the inductor, but what does really puzzle me is how can calculate the zener average ...
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0answers
38 views

How to deduce the current function from the graph?

I want to express the current function based on the next graph So using the slope and the coordinates in the third interval the current will be \$i(t)=\begin{cases} 0\,A & 0\,s<t<t_{1}\,s\\ ...
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1answer
71 views

Output current in collector of BC107

I am working on following circuit involving BC107 NPN Philips TO-92 transistor and voltage source of 4.2 V. simulate this circuit – Schematic created using CircuitLab I got some confusion when ...
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0answers
30 views

LED current rating

I have an unknown LED, I think it was previously run off of ~14vDC. I want to repower it - I have a 5vDC 3A power supply. I dont know the LED rating so I've rigged it up to a simple series circuit. ...
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1answer
54 views

Power bank multiple output currents

I've been working on a simple power bank project that's been built using Li-ion batteries, the batteries are rated 3.3 V. I've implemented a charge controller which can efficiently charge the power ...
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0answers
56 views

How can you have high voltage and low current

I’ve read in another article, that you can have low current and high voltage simply by having a resistor in your circuit. From what I understand, current is the flow of electrons and voltage is the ...
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2answers
26 views

is there a relation between node voltage and the mesh current?

so i have a complex system of resistors i was able to calculate the mesh current of each loop . i was wondering if i can calculate the voltage of a node using the information of the resistor value and ...
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0answers
280 views

How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other? [duplicate]

An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following: While linearity is a truly astonishing property of nature, it is by no means a rare one. ...
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2answers
75 views

What does the current distribution look like on an antenna?

This is more of a conceptual question, but I am struggling with understanding the current distribution on a radiating antenna. I understand how it travels, but how do we know? Is there some paper or ...
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1answer
54 views

Voltage to current circuit simulation problem

I want to control current through of R8 resistor adjusting VS1 voltage. VS1 increased from 0 to 5V, but AM1 and VF1 don't increase or change. Is there anybody give an idea about the mistake? After ...
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2answers
34 views

Amperage rating of thermal fuse

Consider this SW-104T thermal fuse. It has a current rating of 10A. Does this mean that in addition to its thermal fuse capabilities (blowing at a certain temperature profile), it also behaves as a ...
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3answers
3k views

If one sends short bursts of electric current that abruptly turn on and off, why does the receiver receive a smoothed-out current?

An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following: The difficulty which Morse encountered with his underground wire remained an important ...
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1answer
73 views

How to calculate current through a resistor and LED?

Question C asks how's to calculate the current over the led and 3k resistor? Can someone please help me understand how to do it?