Measurements of the current flowing through a circuit

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3
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1answer
36 views

AC power measurement query

I'm trying to understand and tweak this smartplug reference design from TI. I'm stumped on the Metrology Analog Filters section on page 1. What I do not understand is why is there a 0R resistor on the ...
-2
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2answers
41 views

Measure current in power suppy [on hold]

I have a power supply which I ordered online for 100 amps. I thought it will be digital but its an old fashioned type. I want to build the current sensing circuit to find out how much current is ...
1
vote
1answer
37 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 ...
0
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0answers
42 views

practical design of integrator circuit with Rogowski coil

I am designing a current sensing device, using a rogowski coil.To give a simple explanation of the Rogowski coil, if I were to disregard parasitic components L2, R1, C1 and R2 the output voltage would ...
0
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1answer
15 views

Why is bi-directional current sensing required in sensorless BLDC field-oriented-control?

For the past few weeks I've been trying to understand Field-oriented-control for 3-phase motors. Eventually I would like to implement one. I've gone through dozens of application notes from Microchip, ...
0
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0answers
24 views

High-accuracy non-invasive current sensors for sub-metering [closed]

Let the smallest home-appliance for which we need to measure current be of 10W rating. For a 220V-240V supply, that current is just above 40mA. One of the main intentions here is to perform ...
0
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1answer
32 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 ...
0
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0answers
22 views

How to measure 3phase RMS currents in PSCAD

I would like to measure 3 phase rms current as well as voltage of a load, In PSCAD 3ph rms voltage measuring block is available but there is no such block for current.
0
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1answer
54 views

FET Current limiter 30A and overload detection

I plan to make a module for my motorbike to replace fuse by current limiters and overload detection system. I've heard nice things to do with J-FET. It should work up to 12V 30AMP. The detection ...
-3
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2answers
76 views

How to make ammeter with arduino?

i'm interested to make ammeter from arduino. So, i have 70A/50mV shunt resistor and wiring it into arduino. From my schematic, Is this possible to meassure the current from 12V battery?If it possible ...
1
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2answers
62 views

ADC error for low-voltage measurements

The application is high-side current sensing for a battery-operated device. The current drawn from the battery goes through a shunt resistor, the voltage across the resistor is amplified by an INA, ...
0
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0answers
34 views

Effects of introducing offset in a current sense amplifier

I am working with the MAX9643 current sense amplifier in a configuration similar to this. I need to introduce a small offset in the output voltage. What are my options of doing this? Can I directly ...
2
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0answers
95 views

Current sensing at μA accuracy and ADC nonlinearity

Project context A battery-operated positioning device sends location information through GSM at regular intervals. Between the fixes, the device is in low-power mode. The battery is supposed to last ...
0
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0answers
32 views

High voltage reading isssue

Here i am attaching old and new schematic for reference.While designing the old board i have made mistake keeping HV- (j14) as common ground reference . J14 and j12 are connected with high voltage ...
0
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1answer
27 views

Current in a galvanic cell

I was looking through chemistry textbooks to find out how to determine how much current a galvanic cell should generate and what affects that current value. However, I did not find anything: textbooks ...
1
vote
1answer
69 views

What type of fuse should I use for this basic electronics design?

I'm creating a simple Arduino project that utilizes a solenoid and a rotary encoder. I'm powering the entire device with a 12V 5A switching power supply. I want to add a fuse to the design but can't ...
1
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2answers
57 views

why is the current of a aluminum-hydrogen galvanic cell low

I am having a galvanic cell with the following half cell equations: Anode--> 2Al(s) + 6OH --> 2Al(OH)3 + 6e- Cathode--> 6H+ + 6e- --> 3H2(g) I connected my cell to a 47 ohm resistor and measured ...
1
vote
2answers
42 views

measuring a bad motor and large current spikes in a brush motor [closed]

I am new to this forum, I am an EIT and I have been tasked to implement a fixture to measure high current spikes on brush motors when loaded and unloaded. I am at a loss here as I have never ...
-1
votes
1answer
41 views

Rogowski coil with magnetic core

is it possible to use a rogowski coil with a magnetic core? ie i want to integrate the output of such coil rather to place a resistor on it. so, what is the differences between it and a current ...
0
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1answer
52 views

What does the values or details mean? [duplicate]

You can see some values on all electronic devices like 5V,0.2/0.3A on mobile chargers.What do these values represent?what can we understand from them
2
votes
1answer
77 views

Piezoelectric Voltage and current measurement across a 3.3kohm resistor.

I am testing a PZT 43 material with tapping sequence. The measurement of the material is: 10mm in length and 0.8CM in diameter. I am tapping the material with a plastic and holding it down with a ...
0
votes
1answer
39 views

DC Fan using less than half of rated current. Looking to overvolt

I have a project involving a 200mm 12VDC PC cooling fan (FS-200RB) that will be used for cooling me - not a computer. The fan is labeled: 12V DC / 0.42A / 5.04W ...
0
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1answer
14 views

current of a galvanic cell

I am having a galvanic cell with the following half cell equations: Anode--> 2Al(s) + 6OH --> 2Al(OH)3 + 6e- Cathode--> 6H+ + 6e- --> 3H2(g) So my cell is producing 6 electrons. Is there a way to ...
2
votes
1answer
132 views

How to measure supply currents ranging from 1μA to 10mA?

I’m building a battery powered data logger with a microcontroller and several sensors. I’d like to measure the supply current of individual parts with idle currents in the μA range and peak currents ...
-1
votes
1answer
45 views

how to measure current of a galvanic cell with a voltmeter

I was wondering how I could measure the current generated by my galvanic cell: can I just directly connect my voltmeter to the two electrodes of my cell, or do I have to put it in series?
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2answers
83 views

Current limit using MOSFET

I am driving a 24V DC Motor which can draw up to 30A and I would like to incorporate some over current/short circuit protection. As such I am planning to place a shunt resistor and power ...
0
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2answers
45 views

Low side current measurement

I have a system similar to the one given by schematic. There is a 12V battery used for supplying MCU board and couple of distributed boards(inverter/measurement network etc.). Since I want to measure ...
0
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2answers
47 views

Problem with expected and actual current

I measured the voltage generated by my wind turbine as 0.91 V with a load of 180 Ohms. So theoretically, using ohms law, my wind turbine should produce an amperage of 0.05A. However, it produced ...
0
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2answers
36 views

Are “Apk” and “Amp peak-to-peak” the same thing?

Folks, What is the difference between "Amp pk or Apk" vs "Amp pk-pk (or Amp peak to peak?)" Are they the same thing?
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votes
1answer
55 views

how to measure current generated by wind turbine

I was wondering how to measure the current generated by a wind turbine? I tried connecting the voltmeter to the metal connectors of the motor (the 2 metal parts that stick out the motor) and set my ...
0
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1answer
109 views

from this three which one is the best best current measuring method?

so i'm planning to build a battery power meter where it will measure voltage,current,mAh,WH ,and i have created the voltage divider for voltage measurement ,but i cant decide which current measuring ...
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votes
2answers
52 views

Maximum current available from a source [duplicate]

How can we find the maximum current a source can provide,say if my device need 1amp and the source can provide 2 amps in the rated voltage will my device only draw 1 amphere or will it draw 2 amp in ...
7
votes
2answers
209 views

Best way to calibrate ADC for current sense MOSFET

I'm using the infinion BTS6143 as a current switch and current measurement device in combination with an STM32 controller. The BTS6143 is an integrated MOSFET with internal charge pump and ...
0
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1answer
93 views

How to measure a BC-547 transistor's details?

I am new in electronics. What I am trying to do is measuring everything of BC-547 transistor's details from a basic circuit design practically. I want to measure as example: collector-emitter ...
0
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1answer
111 views

PCB Current Shunt Design

I want to use a shunt resistor to measure the current flowing though a section of my circuit. I am deciding between using an off the shelf shunt resistor or simply drawing a wide track on my PCB and ...
0
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2answers
46 views

The effect of input current from a voltage regulator

I have an input voltage of 24VAC and I'm converting that to 5VDC by using a simple diode and an LM2596S-5.0 (A switching regulator powered by a simple half-wave rectifier). I expect to draw roughly ...
0
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2answers
101 views

Twisted pair for long distance voltage measurement

I want to measure the voltage drop across a shunt, but the ADC performing the measurement will be far from the actual shunt - perhaps five meters. I'll need to measure voltage drops across the shunt ...
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4answers
81 views

Measure indcutor ripple current in a SMPS

I need to measure the ripple current in a buck converter. In general, I add leads to the inductor and use a current probe. My issue now is that the inductor I am using has such a low inductance that ...
3
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2answers
66 views

Capacitor for current transformer measurement circuit

I want to measure an AC current with a current transformer and an arduino device. I found on a website ...
0
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1answer
80 views

the maximum and minimum output voltage of op-amp

my question is a bit specific, I have done the research but I got confused. I am trying to measure the current using current sense resistor and a current sense amplifier INA 210 . my measurements ...
9
votes
5answers
766 views

What is the difference between high precision resistors and current sense resistors

Actually, I am trying to build a current monitor for a wireless sensor network. I am going to use a current sense resistor as the current will pass through the resistor. By measuring the value of the ...
0
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1answer
67 views

Measure current of multiple loads with one sensor?

I have been doing some research for my project which requires to measure power consumption of 8 different loads. For that I plan to measure current in each line and multiply that with the voltage of ...
0
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2answers
100 views

Can I measure if current is on or off in cable with 24v DC (in a cheap way)

I have a number of valves that control the heating in rooms in our house. The valves have a pin on top which opens or closes the valve. The position of the pin is controlled by a regulator that sits ...
0
votes
1answer
57 views

How small should I make my shunt resistor?

I have a small multi-junction solar cell that I will be taking measurements of short-circuit current and open-circuit voltage periodically in order to approximate an IV curve for the cell. I have ...
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2answers
54 views

Can I drive a led light with help of a CT clamp

If I have a 230V wire with alternating current and a load in the far end, drawing current. Could you "steal" energy with a CT illustrated in the image, to for example drive a led light? BR Chris
0
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3answers
143 views

How to measure small currents using current to voltage converter?

The battery voltage = 12 volts. In the first circuit The op amp works as a current to voltage converter and its output equation is: Vout = - I * R I choosed R to be 20 ohm so that each 50 mA will ...
0
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2answers
68 views

Calculating AC power figure using the DC current consumption

In a system where I have 220V AC recitified/regulated/converted into 3.3V DC through a transformer and a voltage regulator, would the amount of current I will be drawing from the AC line equal to the ...
0
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2answers
60 views

Choice of current sensing reisistor

I need measure a 10A AC current, and need a 50mOhm current sensing resistor with tolerance <= 1% and good temperature stability. I find there are some choices, such as Vishay's RH,NH series, or ...
0
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2answers
38 views

Possible calculation error using current divider rule on a non ideal current source circuit

I am going through my notes in preparation to an exam, the following was taken straight from the board as my lecturer wrote it. As far as im aware the current divider rule should be $$I1 = It * ...
0
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1answer
56 views

Voltage regulator Current regulation

I want to understand the concept of current regulation in the circuit, In my research I came across the following link Boosting Regulator Current for IC 78xx by MJ2955 where in the circuit schematic ...