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

learn more… | top users | synonyms

1
vote
3answers
71 views

How to prioritize a current path in a circuit [duplicate]

Here's my problem: I have a power supply rated at 5V, 2.1A I need this to feed two devices, both running at 5V Device one is a single-board computer that can consume anything between 0.5A and ...
0
votes
2answers
72 views

How can i make a 3.3v ouput from 9v battery?

I'm a newbie in embeded system and basic electronics ,Yesterday i purchased a esp8266 wifi module from amazon along with ftdi usb driver i'm also have an Arduino uno, esp8266 require 3.3 v . Arduino ...
1
vote
1answer
23 views

Detecting motor stall with lm311

I have 9v DC motor that I want to use to lock a door. Control is achieved using an esp8266 board. The esp8266 also switches the direction of rotation via an H bridge. So far, so good.. Now I want to ...
0
votes
3answers
43 views

Strange IC input leakage current

I am reading the datasheet of the HEF4894BT. First I saw the input clamping current is rated at 10mA and than I saw the input leakage current would be 10mA, too. I thought the input clamping current ...
-3
votes
1answer
16 views

Current rating of adapter [duplicate]

I have a 12v adapter which has a rating of 1.5A. 1.5A is a large current. I've used the adapter to power a microcontroller board. The microcontroller board has an lm317 linear voltage regulator to ...
-5
votes
0answers
27 views

Artificial Lightning [on hold]

I am planning to create artificial lightning from home electricity (240V AC).In order to do that I need to have two balls, one with positive and one with negative charge with high potential difference ...
0
votes
1answer
25 views

BJT gain.Width of base region vs collector current

We know that in active region Ic=beta(Ib),so it means that as Ib decreases the Ic should decrease proportionally,but the early effect states that as we increase Vce the width of the base region ...
2
votes
1answer
39 views

Switch in Circuits

I am really confused about what happens to the circuit when the switch is open or closed. What does t=0 , t=0+ , t=0- , t<0 and t >0+ mean ? what does it mean if the switch has been in ...
0
votes
1answer
51 views

Behavior of power supply and DC motor for voltage/current combinations?

Are the below statements correct? Marked in Bold and Italic are my doubts! Unregulated power supply (Battery?) If supply current rating > motor current rating --> No problem since motor pulls only ...
1
vote
1answer
77 views

Does +12V to -12V = 24V?

If a battery gives me a 5V terminal and a 0V terminal I calculate power by multiplying total current of the circuit by 5V. What if the battery has a +12V and -12V terminal I'm using to power my ...
0
votes
2answers
53 views

powering op amp current

I think this might be a bit of a stupid question, but I've got a bit of mental block on it. I'm trying to power a CA3140 op-amp. I have a 12V source, and an AMD660 inverter to provide the negative ...
0
votes
3answers
149 views

I can't understand the logic with power = voltage * current

I mean, if I have a 2000W device and plug it in a 220V outlet, it will produce about 9,1A. But if somehow the outlet is not delivering 220v, but less, like 180V, according to the equation, it will ...
5
votes
4answers
1k views

Antistatic mat , how it works?

I have a large anti-static mat lying on the table of my workdesk, which looks like this. And it's connected to ground through the wall outlet from one point, meaning it's an open-loop: Let's say I ...
-5
votes
0answers
33 views

Increase Motor Speed By low Voltage (AC) [closed]

i want ask question How i can increase motor speed AC not DC ? IF i set arm from this arrange motor , gar , arm . this arm will increase this speed . if yes what is relations with it and speed ...
1
vote
1answer
42 views

Measuring DC current with Hall Effect sensor over PIC on the same circuit

Before I begin with my question just so you know I'm not very familiar with electrical engineering so please forgive if I ask some dumb question :) What I want is to know if I can use Hall Effect ...
-1
votes
0answers
67 views

voltage amplifier stage for audio

Are there any blaring reasons for why this voltage gain stage wouldn't work? Or anything that can obviously be improved upon? I don't currently have a current mirror to bias the bases of the voltage ...
0
votes
1answer
27 views

bjt current biased in ltspice

For some reason when current biasing a very simple BJT common emitter circuit in ltspice, the current source needs to produce a massive amount of voltage. Why would this be? I'm biasing it at a Q ...
0
votes
0answers
8 views

ADE7754 irms value

i am using ADE7754 to measure 3 phase voltage and current. I am able to read voltage values, but not the current. Micro-controller that i am using is ATSAMD20e18. Can anyone help me out with this ...
0
votes
2answers
49 views

How can I invert this current control?

Below circuit is an emitter follower supplying current to an LED. A DAQ board is outputting 0-10VDC voltage to the base and cannot supply more than 5mA. Thats why the LED is not directly hoked up to ...
0
votes
1answer
64 views

Display of set current on a variable bench power supply

I'm making a bench power supply, which will go from 0 to 17VDC and up to 30ADC at the output, which will have a voltage and current regulation (with potentiometers). I am wondering, is it okay to use ...
0
votes
1answer
30 views

High Torque DC Motor

I am trying to use a high torque dc motor with gears to drive a low torque dc motor but with higher rpm. Is there a relationship between the current draw of a DC motor with the torque? I have seen a ...
0
votes
1answer
44 views

Current division into three branches

Please see the image below for the circuit. I am trying to find the currents through each branch in the circuit. However one part, which is essential in finding currents through all the branches, ...
0
votes
2answers
119 views

Can current flow both ways through a transistor?

Last night I was experimenting with and motors and transistors. I was testing out NPN and PNP transistors to learn more about how they work and how I can use microcontrollers to control the speed with ...
0
votes
1answer
27 views

Nodal analysis how to determine high and low potential for current

The rules for nodal analysis is that current flows from the higher potential node to the lower potential node, with the mathematical equation being: \$I = \frac{Vhigher-Vlower}R\$ However, how do ...
0
votes
2answers
39 views

Purely Capacitive AC - voltage and current relationship

Studying electronics, capacitors in AC circuits currently. Can not understand two formula's. I see it stated as fact: "In purely capacitive AC circuit Current leads Voltage by 90 degrees." I ...
0
votes
3answers
89 views

AA battery current

For some reason whenever I play with a multimeter it always gives me results I never expect. In this case I am attempting to measure the current of a AA battery. I have the multimeter set to 10A on ...
0
votes
0answers
53 views

Simple 1.2->12V, 5A current limiter circuit with limit indicator

I have a voltage source which varies between 1.2 and 12V, and I would like to limit the current between 1mA and 5A. The voltage source is a switch mode power supply, and the current limiter has to be ...
1
vote
1answer
50 views

2 NPN configuration that apparently works by small Recombination Currents

simulate this circuit – Schematic created using CircuitLab In this configuration of 2 NPNs, how is V_OUT following V_IN? Ignoring recombination current: Assuming conventional current, ...
0
votes
1answer
44 views

If current consumption of serial flash SST26VF064B is 15mAq104MHZ then at 50MHZ it is 7.5?

I am Mohan working in Germany. For my data logger project i choose SST26VF064B serial flash. My data logger should consume lowest power possible. I see that SST26VF064B is consuming 15mA@104MHZ. In my ...
0
votes
1answer
64 views

Loaded Voltage Divider

Could I get some help with this question: Set up an equation for the I (V) containing constants E, R1 and R2 and variable U, when the voltage in M1 is loaded. RL shall not be included in the ...
0
votes
0answers
57 views

Voltmeter and Ammeter measurement

I have an assigment that I've been working with for at least two hours and I literally don't know how to start or think.. This is my assignment: Draw a picture of how the voltmeter and ammeter ...
0
votes
4answers
44 views

Redirection of electrical current

Sorry if this is about the newbiest question on this site, If I were to draw a graphite trace on a piece of paper (which from what I know would have some amount of resistance), and connect a ...
1
vote
1answer
44 views

Measuring quiescent current of a voltage regulator

I purchased 10PCS Socket Adapter plate Board For NRF24L01+ Wireless Transceive‚Äč module and would like to know how much current/power it will draw as I want to run a project on batteries. A close-up ...
-1
votes
1answer
58 views

Finding inductor current at infinity

Can someone please explain how to go about solving this? I understand how we obtain Vc but when looking for the inductor current at infinity I get confused. Thanks!
0
votes
1answer
37 views

How to calculate power draw per rail, to see if Power Supply can handle the load?

I am purchasing this power supply for a computer I am putting together. http://www.mini-itx.com/store/information/picoPSU-160-XT.pdf and while in discussion with a rep, they spoke about not ...
0
votes
1answer
22 views

DIN 41612 current rating - peak or RMS?

DIN 41612 connectors are rated at 2A per pin. Is this the absolute maximum current or RMS? I want to use a DIN connector for power level audio. Music signal peaks commonly reach 24 dB (16x) above ...
0
votes
0answers
36 views

Step down converter circuit overheating

In the above circuit, the voltage is set by R7 to be about 4.1V. The coil L sets the output current to 1.2A. Input voltage is limited by C1 at 16V (approx. 14V in reality). The circuit is designed ...
0
votes
4answers
104 views

How to design Current Amplifier circuit to amplify the signal current to 1A

I am trying to design a current amplifier circuit to amplify a signal current to 1A. Application : I am generating a signal using microcontroller (for ex : Pic16f877A). This signal is 5v having 10mA ...
2
votes
1answer
59 views

How well do relays handle brief overcurrents?

Unlike solid-state devices, relays often (in my limited experience) do not come with maximum peak current draw, only maximum continuous current draws. In general, how well do relays take pulses of ...
0
votes
2answers
51 views

Voltage regulator UA78S09 (9V/2A) supplying only 0,4A of current

I power voltage regulator by 12V / 8A power supply. UA78S09 is responsible to convert voltage to 9V for DC motor, which is able to swallow 1,5A at start and under heavy load. Motor however does not ...
-3
votes
3answers
92 views

What type of Lithium batteries work best for my project [closed]

I have a scooter with 48v/1000w motor, now I am trying desperately to find a lighter lithium battery but I'm constantly told it will be an impossibly expensive endeavour since lithium is very costly, ...
0
votes
1answer
42 views

Do I need to connect a resistor to either one of the 2 input pins of this “and” logic component? If so, what would be the value for it?

The said component is sn74lvc1g08 from TI, datasheet. I was planning on connecting 3 1.5 volt AA batteries (in other words, 4.7 or 4.8 volts max in total) to one of the input pins (either A or B) and ...
1
vote
1answer
33 views

Managing Peak Motor Currents with Capacitors

I'm currently working on a project involving three 90V 5A DC stepper motors controlled by G320 Geckodrives and powered using a single 90VDC 13.5A power supply. I'm working with a mentor who suggested ...
1
vote
0answers
21 views

Ohmic Power Loss of the Peltier Element (PWM Vs Linear current)

I want to design a circuit to drive the Peltier element. The first option is to drive the peltier with PWM and the other option is to use a sync buck convertor, which is likely adding LC filter to ...
0
votes
1answer
33 views

Current Transformer properties

I have a mains track (230VAC, 50Hz) on a custom PCB routed to multiple Solid-State Relays, and I want to measure the power going through this line. I'm looking into Current Transformers (CTs) to ...
-2
votes
0answers
69 views

Is it possible to have a one way conductor?

Can you have a material such that, current can only flow in one direction, (or more accurately it is easier for negatively charged particles to move in one direction than another within the object, ...
1
vote
2answers
89 views

How to create a linear current response from a passive pot circuit?

I am wanting to linearise the current response of a circuit which currently has the resistance change from a linear pot. I have a current input that I want to test using a test jig/simulator. The ...
0
votes
0answers
6 views

One laptop charger for laptop and monitor? [migrated]

I have a monitor and a laptop and their chargers together are 91W. Both of them are 19V. So I was wondering whether I could just use a 90W charger and a cheap one male to two female 5.5x2.1mm splitter ...
0
votes
2answers
29 views

Transimpedance amplifier with current amplifier circuit.

Figure shown above is the current amplifier circuit with the output current feeding into the transimpedance amplifier (I-V amplifier). I'm using a 100mV ac signal and 120 Kohm resistor to produce a ...
-4
votes
3answers
136 views

Drawing too much current from a SATA power Y-cable?

I'm planning to use a Y-cable to split one of the power connectors inside of a notebook. Now if I connect a harddrive to the Y-cable, could another device soldered to the Y-cable draw so much current ...