An electrical load is an electrical component or portion of a circuit that consumes electric power. This is opposed to a power source, such as a battery or generator, which produces power.

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Micro-controller as a load

For my power-supply micro-controller is a load. How does this load behave like? is it resistive or capacitive or inductive load?
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32 views

Newton Raphson Method Load Flow Solution Failure Causes [closed]

Newton-Raphson method is used to solve power flow problems. When does this method fail? WHile solving normal single variable non-linear equations, this method fails when the initial guesss made is a ...
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2answers
29 views

Test Battery Volts applying load

Why we need to apply a load to a battery to test its voltage? I've been testing battery capacity so far using a multimeter and just hooking the probes in the positive and negative side of the ...
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1answer
58 views

Controlling dc motor in arduino with and without a load

I wonder if there is an alternative solution to this problem: I have a 3v water pump being controlled by an arduino, which pumps water out of a bucket. I would like the pump to turn off once the ...
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2answers
55 views

How can I supplement a portable generator during peak load.

I'm contemplating purchasing a 2000W generator, to power some of my tools. One potential issue i that I have a saw that pulls 2500 W at startup and then 1800 w to run. Seems to my that as the ...
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1answer
84 views

Oscillator and output load

For the Ethernet application in my design using RMII interface, I need to drive two CMOS loads (two reference clock pins, one of a Freescale Kinetis K60 Microcontroller and one of a TI's PHY chip) ...
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1answer
42 views

estimating battery discharge current approximately from ac load current

I would like to know that if we have a data logger installed at a site and the logger measured the constant load current of 10 A from the Grid(Single phase@ 230 v) during a certain time say 10 am. ...
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2answers
162 views

Java/Arduino Controlled 120VAC Power Outlet

I'm working on a project with an end goal of controlling a power outlet with a Java program. Currently, I have the relay wired to outlets, a 3 prong 120 VAC plug, and my Arduino. Everything works as ...
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1answer
33 views

AC voltage source - variable load

I'm looking for some kind of idea for controlled load for AC source testing. The output signal of source is a bipolar sine wave 5 Vpk (so it varies from -5V to 5V) and it has 1.5kOhm series ...
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0answers
30 views

3 way dimmer installation

I'm installing a three way dimmer on a 3 switches line for a light. In the dimmer notes the installation is done by replacing the three way switch on the load side. Can I replace the one at the line ...
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1answer
36 views

Electric load - Switching vs Continous

My realy says "Switching up to 16A (max. 3680 W / max. 2500 W continuous)". Does this really mean I should not have it connected to loads over 11A, in a 230V system? What would be an example of ...
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1answer
146 views

Load cell amplifier circuit

I'm designing a circuit to take two load cells as inputs, and make their sum. I'd like to know your opinion about the design. Each cell is connected to one instrumentation amplifier (INA122P). ...
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1answer
44 views

fast 5v High Side switch controlled bz 3.3v

For my led cube, I need to switch 5V (common anode layers) with 3.3v (pic32). This should happen at a high frequency. In recent builds I used pfets, but because I'm using 3.3v now, a pfet wouldn't ...
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1answer
709 views

Effect on loading a DC motor - load torque

Can someone please give a (detailed) explanation (perhaps with formula's) of how the load (torque) affects the armature current of a DC motor (seperately excited or shunt or series) ? As the load ...
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1answer
50 views

Power management at thermal power station

I have weird question, but I hope somebody can give at least hint what should I read to understand the concept. Imagine situation: There is thermal power station and a city that takes power from ...
2
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1answer
101 views

Determine the maximum load of a power supply

I am trying to upcycle an old bit of tech I had lying about. The main part I am looking to recycle is the power supply however I do not have specs of the power supply itself. I have measured an output ...
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0answers
48 views

Cycling peak load trips genset

I have an application where a cycling peak load from a 40hp motor is regularly tripping a 65Kw genset. Here are the details of the configuration: 65Kw Genset powered by a natural gas engine 40hp ...
2
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2answers
195 views

why does the parallel resistors with voltage source can be ignored as well as resistors in series with current source in term of equivalent circuit?

I have a problem dealing with equivalent circuit. I don't know why when the resistors that is parallel with the voltage source can be ignore as well as one in series with current source. Of course the ...
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1answer
122 views

Where does the current in a Dickson Charge Pump come from? Does the oscillator/PWM pin of a microcontroller also source current?

Well, I am making a small circuit which looks like this: When simulated, the load current gets up to about 200-280 mA no problem, so I want to implement this circuit in real life. My only problem ...
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2answers
253 views

Output voltage of unity-gain buffer varying with current?

I'm working on a VLC+IR transmitter that runs from batteries. I decided to use an LM317 so that the discharging battery wouldn't really affect the current through the LEDs. (Disclaimer: I've never ...
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2answers
265 views

What determines a load's current requirements?

Apologies if this question has been asked before. I'm sure it has but hard to find as wording of question may not bring up the duplicate question. Let us say we have a 10 ohm resistor as a load. ...
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4answers
769 views

Give a RL load, how do you calculate whether if it is capacitive or inductive?

This is a topic which has always confused me. For example, if the impedance at the load has the form of \$Z = R + jX\$, \$R\$, \$X\$ positive real numbers, then then network is called inductive. If ...
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3answers
169 views

Load sharing using asynchronous motors

I am involved in the design of a system composed of: multiple asynchronous motors, each equipped with separate drive, all acting in parallel on a load, via a common rack and pinion transmission. ...
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1answer
162 views

RF load (terminator) at the end of RF attenuator

Do I need to install RF terminator at the end of RF attenuator? Let's say that max power output for RM port is 50W and I'm using 100W 50dB attenuator. What if I was using 50W 40dB attenuator? Is there ...
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2answers
83 views

Do batteries have a delay when adjusting to a new load?

So I am creating a battery voltage measure, and it takes a reading both when the battery is in open circuit, and when it is loaded with a 100mA constant current. I have set it up and the reading is ...
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2answers
71 views

Comparator Output Swing Measurement

i wan't to measure the maximum and minimum output swing of a Comparator. I'm using the circuit which you can find attached. However, since the Output of the Comparator (TI LM2903) is open drain, I ...
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1answer
123 views

ADC Reading is much lower than expected

I am using a EFM32GG990 microprocessor and I am trying to get it to read a voltage using it's on-board ADC. I have made a circuit that I wish it to measure, both the loaded and open circuit voltage ...
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2answers
353 views

How to hook up a load cell to an Instrumentation amplifier correctly

I am trying to get load cells connected to an instrumentation amplifier. The load-cells I have are extremely similar to the ones here https://www.sparkfun.com/products/10245. They have 3 wires coming ...
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1answer
488 views

how to select capacitor for a crystal oscillator

Here is a 32 MHz crystal from one of TI's reference design The BOM list defines the crystal as ...
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0answers
70 views

Solar charger under rapidly varying conditions/impendance

My solar equipment consists of: Solar panel capable of: 20V Peak / 3.6A Peak Li-Ion Battery pack: 8.7V, 9Ah, (2S3P setup) My solar charger setup consists of: 5A DC-DC BUCK converter (XL4015) ...
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1answer
110 views

Differential amplifier with active load Sedra Smith

I'm studing differential amplifiers on Sedra Smith book, and I have come across the following circuit. My question is: how can NMOS transistor \$Q_2\$ have a current \$g_{m2}\cdot v_{id}/2\$ if the ...
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0answers
55 views

How do I determine what size generator I need?

What are the number of factors and considerations to be taken into account before sizing a prime rated generator? I am having a situation where I would be having 3 motors of 10 kW each and all these ...
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1answer
77 views

Capacitive load at the output for analysis of CMOS cells

This question is very rudimentary one. Please point me to the link if this question has been already asked. In general, when working with simulations and and analyzing the standard cells designed ...
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1answer
142 views

Level Shifting & Amplification

I am trying to design a crane load (Weight) measuring unit using motor current measurement technique. For some reasons we can't use load cells here. Part of schematic I have drawn here An air core ...
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3answers
368 views

Is a protection diode needed for a resistive load?

In some applications a flyback diode is added parallel to the load. Is that because the switching causes reverse voltage for inductive loads? What if we have a resistive load instead? Do we still need ...
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1answer
64 views

Transformer size?

How can I set the size of a transformer for a cooling fan project? The load is 100A, the power supply is 125A, we will take input from 230Ac 60Hz. Incoming two phases and outgoing also two phases but ...
12
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1answer
527 views

Capacitor exploded - why?

Recently I had an explosion on my desk. A 220uF 25V electrolytic capacitor just blown up shortly after attaching a load. The high-level connection was: Phocos CA08 (solar charger controller) -> ...
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1answer
130 views

Motor Control For Overload

I am using PIC 18F45K80 for four phase dc motor control operation. The maximum load current is 30 Amps. If it exceeds 30 Amps, I have to call stop_motor() function in my coding in order to switch off ...
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0answers
60 views

Battery-load query

Imagine the following circuit. The load consumption varies during the time (during a minute it has 3 different current consumption). When the DC source generates power, where does this power go? (to ...
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1answer
128 views

Maximum load current that is still indistinguishable from battery self-discharge

I am designing an electronic device that will be powered by a battery, and I am trying to keep my device's current draw in standby to a minimum. Specifically, I would like to keep the current just low ...
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1answer
419 views

How to correctly edit a system to increase per-unit voltage of a bus [PowerWorld Simulator]

I have created and simulated the following energy system using PowerWorld Simulator 17 (please download the picture if it's not clear). Now, I was given the requirement that every bus should have ...
4
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2answers
151 views

Why use asymmetrical capacitor values for crystal?

Are there any circumstances where you would want asymetrical load capacitors on a crystal? I came across this schematic in the documentation for an NXP UART. It looks just wrong to me. Can anyone tell ...
3
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1answer
374 views

Load cell, help

I am using load cell, from here. Load cell specification are mentioned on the site. 5 wire coming out, its a 4 wire core shielded load cell. What screwing thing i am facing is: Getting same voltage ...
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3answers
216 views

How to calculate power supply for 100x loads @ 3V 700mA

I'm currently designing a setup using 100x loads that requires a 3V 700mA supply ea. The loads are connected in parallel with the main power supply. I'm a bit doubting about my power supply dimension ...
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1answer
215 views

Instrumentation amplifier for load cells

In the most part of tutorials I see they use INA125 as the instrumentation amplifier for load cells. Is it ok to use another cheaper amplifier as the AD8237? Or is there a specification or ...
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1answer
266 views

Does this loadcell's creep mean that I can not let a constant load on the loadcell?

I want to build a connected scale that I can set coffee powder (for example) on it and check over the internet how much of coffee I still have without going to see it. Usually all loadcells have a ...
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3answers
732 views

Load Resistor across Crystal

What is the purpose of using a 1M Ohm resistor across crystal pins? Please refer to the image for clarity. The crystal serves as the clock source for an USB Hub device(LAN9512). There is nothing ...
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1answer
137 views

Power opamp 'floating' output

So I had to design an amplifier with a 'floating' output. (I don't know if floating is the right word, it's the direct translation from dutch.) See the picture below ( I drew it whilst sitting in the ...
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1answer
101 views

How will I know the Power Efficiency of a load?

I have a thevenin circuit with a source load. How will I get the Pin and Pout?
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0answers
160 views

Parasitic inductance causing large current spike

I'm studying the performance of electrodes in methanol fed with a pulsed DC power supply. By this I mean the power supply is being turned on and off in a controllable frequency and duty cycle. If I ...