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

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1answer
9 views

How do I calculate maximum current that each pin of PC8575 is able to sink?

http://www.nxp.com/documents/data_sheet/PCF8575.pdf Can somebody tell me which parameter one should look for while looking for calculating maximium Current source/sinked by a pin.
0
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0answers
9 views

Surge corrent interfering with A/C DIMMERS. SNUBBER. ARDUINO. Valve Solenoid

I have an issue with SURGE CURRENTS interfering with my dimmer modules on a Arduino-Mega home automation system. I would be very much grateful for any help in configuring an adequate RC SNUBBER ...
0
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0answers
11 views

Question regarding specifications of power bank for a laptop [migrated]

I'm not sure about how it suits the forum of electronics here on stackexchange, but I hope I'm at the right place. if not, please forgive and explain. So the case is that I own a high-end laptop (...
0
votes
1answer
69 views

Is a neutral wire necessary between 2 circuits

Suppose I have 2 circuits with their own individual power supply. Circuit 1 needs to send some sort of signal to circuit 2. Would I need to carry the current back to circuit 1 after the signal has ...
1
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1answer
45 views

DAC controlled constant current source

Was given the task of creating the simplest constant current source that can supply up to 50 mA with an ~700 ohm load. I can use any IC's out there. I stumbled across the chip here from linear tech: ...
1
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1answer
43 views

I can't find the values of the currents

The picture below is on page 7 of the datasheet of TL497, it is a switching regulator that I use as an inverting regulator (it has an inverting mode) to generate -24V from 12V in input, in the first ...
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0answers
35 views

Minimum Switching Current in Boost regulator Datasheet

I am planning to use TI TLV61220 in one of my designs. My design will be in sleep most of the time & the current in sleep mode is 10-20 uA. In active mode, it wil take max 10mA. The device is ...
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0answers
35 views

Pickit3 overcurrent protection

The reason for these questions is I'm using these programmers to test a circuit boards with test firmware so I'm trusting the pickit3 to report programming failures without damage to the USB port and ...
0
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1answer
60 views

Cause of skin effect: eddy current inside conductor

We all know very well that due to eddy current (back EMF) generation within an AC carrying conductor, "skin effect" occurs. Eddy current density: Highest at center of conductor core Lowest at ...
0
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0answers
66 views

Can you only lower the breakdown threshold voltage of solid insulators once with high-voltage?

For example, insulator Z has a threshold voltage of 1000V. After exposing insulator Z to more than 1000V, its breakdown threshold voltage is now 800V. Can I lower the threshold voltage further with ...
-2
votes
1answer
35 views

Input and output relation of ACS712 Hall effect current Sensor

ACS712 works by the use of the hall effect principle. When i went through the datasheet, i found out that the relation between input current and output voltage is varied largely ie. 66 mv/A to 185 mv/...
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0answers
106 views

Mosfet keep circuit closed (vape mod)

Hello i made circuit with IRLB3034 mosfet for using vape mod with low current rated button, but i have problem - mosfet is firing itself when i plug battery in and its overheating (coil is 0.5ohm). I ...
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0answers
65 views

Can anyone tell me how much will it cost? [closed]

An appliance uses 14 * 10^6J of energy for one day. How much will this cost the user if the cost of electricity is 6. 5 cent/kWh?
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5answers
89 views

Plugging the same device on a jack of smaller tension will draw more or less current? [closed]

I'll put a set of ''right's''numbered based on my current assumptions, so if one of them is wrong, you can just point a couple out. Let's say I have a device that is labeled ''660W/220V'', so It ...
0
votes
4answers
122 views

Why is there current flow in the sub-circuits?

I'm struggling with the theory of this(unusual) circuit: simulate this circuit – Schematic created using CircuitLab The load receives no power at all, due to the voltages cancelling out, ...
-2
votes
1answer
87 views

Do i need add a capacitor on this current follower?

Hi,guys. I am making a current follower. I want to know the difference between the circuit with and without that capacitor.(I forget to change the value of each component, just ignore that).
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1answer
41 views

How big does the Schottky Barrier or Band Offset have to be for a junction to be a diode?

Current rectification happens when there is a large Schottky Barrier or a large Conduction band offset (excluding cases such as tunnel diodes). My question is, how large (in electron volts) does the ...
0
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2answers
93 views

What will happen if I connected 3amps adapter to motor that's need only 2.1amps are that will burning the motor?

I have 3amps power supply and the motor just need 2.1amps so if I connected they together are that will destroying the motor ?
4
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0answers
50 views

Mosfet LED switch protection

I'm designing a Mosfet based switch that uses a low current reed switch to control either 24V or 12V LED strip lighting. Having some issues with the protection circuits. My specifications are as ...
-4
votes
4answers
110 views

If I sent a message through a single-circuit telegraph across a copper wire to the Andromeda galaxy, will my message be received instantaneously? [closed]

I recently learned that electric current flows like a bicycle chain where all the electrons push each other at the same time. This got me thinking. Would this have the same effect at an astronomical ...
0
votes
2answers
34 views

Potentiometer controlled current regulation

new one here. Thing is this; I have an electromagnet (or a solenoid as I prefer to call it). When it gets energized the plunger inside is pushed out to a certain length (goes back to its original ...
-1
votes
1answer
62 views

How to simulate BJT cut-off in SPICE

In BJTs, when applying the parameter of collector and base current cut-offs, everything below a given cut-off current gets floored to 0mA, right? So say if we have a configuration with good voltages (...
-4
votes
1answer
99 views

Current, when Zener and normal diode in parallel? (picture inside) [closed]

1.) What are the currents , I1 and I2? And why? 2.) What are the currents here (when the diodes are the same): Thanks.
2
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2answers
423 views

Electronic components without rust or corrosion

Is there any sort of special conductive material that doesn't rust or cause corrosion?
0
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0answers
83 views

Current Amplifier using bjt [duplicate]

The output current through V5 is supposed to be 1A and I am getting around 460μA. TIP122 and TIP127 have minimum current gain of 1000. So the current entering each darlington transistor should be ...
0
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2answers
107 views

Simplest “battery low” indicator for a 3.7 volt lithium ion battery

I just need a single LED to light up when the voltage drops below a threshold like say 3.3 volt ( sharpness is not that important ). I know basic electronics like transistors,logic gates etc. On ...
0
votes
3answers
67 views

Precision voltage reference divider vs. constant current source to drive an RTD sensor

I need to measure temperature with an RTD between 0-300 C. I believe I have two options to make this work: A constant current source feeding the RTD A precision voltage reference and a resistor ...
0
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0answers
62 views

Need help with current pulse input to an analog circuit

I have been struggling to solve an issue about signal conditioning an instrument with an analog circuit. First I would like to explain the instrument very briefly: There is a windmeter which is ...
0
votes
1answer
50 views

voltage in an electrical circuit consisting of a current source

In the following circuit is it correct to ignore the current and simply add all the voltages to measure voltage at open end? simulate this circuit – Schematic created using CircuitLab If ...
-1
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0answers
13 views

Rth for circuit by looking at it from open end

What should the the Rth or THEVENIN equivalent resistance if looked from the open end ? simulate this circuit – Schematic created using CircuitLab what i thought is : Rth= ((50||100)+(...
-2
votes
2answers
29 views

equivalent resistance on looking circuit from two different sides

I want to understand how to calculate equivalent resistance if same circuit is looked from two different sides,one from right side and then from left side and how to avoid confusions in this type of ...
-2
votes
2answers
34 views

r equivalent and Norton equivalent

Can anyone explain how Norton equivalent resistance and R equivalent which is equivalent resistance of network are different in this circuit .
0
votes
1answer
54 views

LiPo discharge control

How to control the amount of current I drain from a lipo? U=I*R and I know R but how do I control the values of U and I? If the battery has 1000mAh, 10C and 10 V (I made this up), does the battery ...
-1
votes
2answers
49 views

current through capacitor in Laplace form

We know that current through capacitor is i(t)=c*dv(t)/dt but what if we want the current through capacitor expressed in Laplace form ? simulate this circuit – Schematic created using ...
0
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5answers
50 views

Neutral wire diameter and phase wires diameter (3 phase current)

I have nothing to do with electrical engineering so this may be lame question. According to Kirchhoff's law sum of currents of L1+L2+L3 should be same as current of neutral wire. What puzzles me is ...
0
votes
1answer
48 views

How to run ammeter in low resistance?

I need to measure current in a small electromagnet powered off 3 x AAA batteries in series. This is the manual for my multimeter. When I run this multimeter in series and try to find the current, the ...
1
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1answer
23 views

Low current to HS gate drive in DRV8825 typical application diagram

simulate this circuit – Schematic created using CircuitLab The typical application diagram in the DRV8825 stepper driver datasheet includes a 1MOhm resistor from VM(the motor voltage) to VCP(...
2
votes
2answers
48 views

Estimate current produced by an IR photodiode on a typical sunny day

How can I estimate or calculate the current which would be generated by an infra-red photodiode (eg. Osram BPW 34 FAS) on a typical sunny day ?
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0answers
31 views

current in circuit in transient state

simulate this circuit – Schematic created using CircuitLab The switch in the circuit is opened at at time t=0. What is the current through 10 ohm and 20 ohm resistor at t=0(-) and also when the ...
0
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2answers
62 views

Currents around transformer

If I use a transformer to step the voltage down from 220V to around ~30V and I expect the 30V end to draw up to ~30A, what kind of current magnitude will I have to plan for or expect to see on the ...
0
votes
1answer
71 views

What happens when discharging coin cell battery too much?

BACKGROUND: I'm working on a project where we use the nRF51 Bluetooth low energy chip, and our first prototype boards just arrived. So I've made some power measurements trying to calculate the ...
1
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2answers
89 views

A basic question on Current Flow, Voltage, and Power consumption

Background: Assume that I have Bulb that consumes 10 watts of electrical energy (power). The operating values for full brightness are: 5 volts, and 2 amps. Since Power(p) = Voltage(V) x Current(I) = ...
1
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3answers
83 views

Current Sensor Resolution

I have an application where the maximum DC current is 160A. However in reality the actual current flow never exceeds 40A. I want to measure the current with an ADC (like one found on the Arduino or a ...
0
votes
2answers
54 views

Help with Texas Instruments SN74LVT125

I am interfacing a 5V system to a 3.3V using the SN74LVT125 to shift down TTL voltage to 3.3V My problem or my question is, Some of the input pins (the A ones) are being triggered by a 5V signal that ...
1
vote
2answers
172 views

How to make a circuit that generates 50mA current at +1.8v within 10ns rise time?

I am using Atmega328 MCU to control a SRAM IC and it is required to power up the IC using a source that can deliver 50mA current at +1.8v within 10ns rise time without any voltage drop. unfortunately ...
1
vote
1answer
59 views

Can not find or calculate ampere hour from the data sheet

Here is the data sheet of a ups: http://www.ups-service.by/PDF/Technical_Specification_PowerWave_60-500kW_English.pdf How long for a nominal 500A current drawing load would this utility last? How ...
0
votes
2answers
167 views

How does a 700W PSU deliver so much power when most wall sockets are limited to about 20 amps?

I will be using a computer power supply to power a car audio amp for a project. The amp is 500w and my PSU is 750w. I never considered it until now, but how does the PSU deliver this? P=VI so 750w=...
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votes
4answers
89 views

How do I use this Switching Power Supply with power from a wall outlet?

I assume the point of these devices is to convert wall outlet power into something useable for electronics projects/products. In my case, I need 24V at 5A for testing an electric motor. So I am ...
0
votes
1answer
42 views

SMPS Short Circuit

I am using an ATX SMPS to power my Orange Pi Plus 2 via 5V supply. It worked fine for a couple of days without problem until yesterday. I happend to connect my audio amplifier TPA3116 which worked ...
1
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2answers
137 views

Using a MOSFET to generate a particular voltage

So ,i wish to cycle 1.4v and 5v through a sensor for 60seconds each. I have a mosfet STP90NF03L with Vgs(th)=1v (min).I am using arduino's analogWrite(pinnumber,value) to get 1.4 v output.. but i ...