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Questions tagged [load]

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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Calculating the ripple voltage from a standard wall adapter power supply

I've come across a formula for calculating the ripple voltage from a wall adapter AC to DC power supply, which uses a step down transformer, fed to a rectifier, with the rectifier output connected to ...
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30 views

Source voltage of circuit with diodes when output voltage is given

Tried solving this using KVL, and solving to get the currents for the different parts of the circuit, however got stuck when trying to compute the source voltage especially that I'm unsure if the ...
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41 views

Difference between horn and power resister?

I have a circuit where my microcontroller is turning off and on a heavy load using a power mosfet (I've also tried it with a mosfet and a relay which yielded the same results). When I use a power ...
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25 views

Load on a Relay [duplicate]

I require a relay that can handle a load of 48V/2amp DC but I can only find relays that can handle a load of 30V/10amp DC. I am wondering if I could still use those as I am only going up to 2amp or is ...
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42 views

How can I determine the voltage the resistive load in this relay?

I am hoping someone can help me understand something. I'm an engineering student trying to analyze this circuit, but am finding myself not understanding and going in circles somewhat. I've searched as ...
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1answer
45 views

How do i find Current Consumed by Circuit designed on Surface mount PCB without damaging PCB? [closed]

I have a circuit designed on PCB, and components (resistors, capacitors, diodes, Microcontrollers etc.) are all surface mount. I want to find the total current consumed by this circuit. I have traced ...
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32 views

Why Current Transformer not working accordingly in two different source-load configurations?

I have a Current Transformer (primary turns = 1, secondary turns = 250). But in my design, I have to pass two wires (current carrying conductors) through it. Case 1: Theoretically, if the same ...
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33 views

Understanding loads on panel board schedules

I need help understanding why loads are divided by phase on panel board schedules, when the current travels through all of the phases connected to a load. I’m going to try to explain it as best as I ...
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16 views

Created this Filter Amplifier Circuit; How do I connect this load while maximizing gain?

*Filter Circuit on Left, Load on Right. To give some background, that load is supposed to replicate a long 12V power line (with other stuff on it) on which we will be sending AC signals on. The gain ...
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4answers
68 views

How to find max load limit in datasheet?

I have а datasheet but I don't understand: how to find max load limit in datasheet? Can I use this SSR to switch the load (12V DC), and what current can I count on? Thanks.
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1answer
30 views

Stochastic Processes wtih respect to the electric load demand [closed]

I am required to look at the statistics (stationarity, mean, standard deviation etc) of the electric load profile. I decided to use the load data for the IEEE reliability test system as it has all ...
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1answer
40 views

Is there any criteria to call a load inductive for switching applications?

I was hesitating to ask this but in many applications such as the ones with electrical machines or relays we always read such precautions or considerations: “If the load is inductive do that don’t do ...
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48 views

stall dc motor 12 volt for long time

hi every one i make water cooling system for dc motor 12 volt how can i make the dc motor hot to test the system ? whan i stall the dc motor the wires get very hot before that effect the motor and i ...
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1answer
51 views

Constant current circuit load and without load for voltage measurement?

How can I control the constant current block? What I need? I need to calculate voltage with constant current load (I = 100ma and after some time I need to calculate voltage without load (I = 0), for ...
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1answer
37 views

Load current computation of complicated resistance network

I'm reading Electronic Principles 6th edition by Malvino. Problem 1.28 describes a network of resistors that I would like to know how to solve mathematically instead of experimentally (as described in ...
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1answer
32 views

DCDC converter load step and phase margin

When applying load step to a DCDC converter we can approximate the phase margin from the presence/absence of oscillation and the crossover frequency as well from the response time. The question is: ...
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1answer
46 views

Constant DC Load Stability and Bandwidth slewrate

For this circuit, how do I know if the rise edge was limited by slew rate or bandwidth? What's the effect of R2 and C2 on bandwidth? -3db of this circuit in simulation is 649 kHz, I know in ...
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2answers
118 views

What should I buy to test whether my DC power supplies are able to provide their rated power? [closed]

I recently bought an aftermarket AC-DC power supply for a laptop which was woefully defective. When connected to a Chromebox, a boot message appeared indicating that the supply could not provide ...
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1answer
61 views

Is Current Transformer secondary current independent of load impedance? and How to find voltage of CT Secondary side?

i am trying to figure out a CT (Current Transformer) which is installed in my device of analysis. This CT has Two wires passing through its center hole (one is phase/red wire of single Phase AC supply ...
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1answer
49 views

Ohm's Law in Practise

When the AUX pin of a stereo is connected to my mobile phone's audio female port, I just measured the voltage at the end of this AUX pin(No load is connected) approximately 2mV using a DMM . But when ...
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1answer
61 views

Voltage across and current through the LED load

Assume that an LED of rating 3V and 20mA is connected in series with a resistance and a supply voltage of 9V is applied across it. For the required ratings of LED, I chosen a resistance value of 300 ...
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1answer
99 views

Load causes voltage collapse. Why?

I have a circuit where a typical 3.7V LiPo battery supplies power through a bq24074 Charger IC, which should in theory short that voltage straight to the output of the charge-protect circuit, which ...
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2answers
177 views

Help understanding/selecting SMPS to drive capacitive load

I recently bought several SMPS buck converter supplies for a project. They all had about the same specs, typically 90-270VAC input, 12VDC output. Having an expected worst case continuous load of about ...
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2answers
114 views

How do current probes load a circuit?

It's usual to talk about loading a circuit when measuring voltage, with a voltmeter or with a voltage probe and an oscilloscope. It can be seen as putting an impedance in parallel to the element whose ...
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1answer
61 views

connecting light

I quickly drew up the lights I wanted to install and connect to two relay and be controlled with one switch. I want the lights on both relays to turn on with the switch. Would the way i drew it work ...
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1answer
109 views

How to design a 3-phase resistive load bank?

We are trying to design a 3-phase resitive load bank to test some step up transformers. We are receiving 3-phase 208v and stepping up to 3-phase 600V with 3-step up transformers wired in delta. Its a ...
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0answers
40 views

POE Load with Wirewound Resistor

I have a 100W 10ohm wirewound resistor. The datasheet is here: https://www.mouser.com/datasheet/2/303/HS-Datasheet3-779273.pdf. I need to make a 25W POE load that can be used with a POE splitter. I ...
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2answers
159 views

Low Pass RC Filter for Load Cell

I have a load-cell setup with some noise that I would like to filter out. I have a vague understanding of low-pass RC filters. I have a strain gauge with 350 ohms of resistance (no load). How can I ...
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2answers
38 views

Making a resistive load using Resistor

I am trying to make a load using resistor that can bear 12V 4A rated values. I have calculated a resistance but that has a low resistance and high power rated resistor i.e. 3 ohms 48 Watt resistor. It ...
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2answers
59 views

What is a Kva in simple terms, for somebody who doesn't know electrical engineering?

I have a DC circuit that runs on 8.1 A × 12 V (97.2 W). Power is supplied from a AC-DC transformer that plugs into a socket. How many of these can I run in a place that provides a maximum of three-...
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2answers
93 views

Is this ADC capable of better performance?

I am using ADS1231 to get values from a load cell,i am using the ADC in following configuration. i am powering the micocontroller and loadcell by 5Volt supply as shown in above image. i am getting the ...
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1answer
30 views

Calculating for Load Resistance given a T network in between the source and the load

Problem: Calculate the value of load resistance (Rl) for which maximum transfer occurs. Attempt: What I know is that for the maximum transfer to occur, the load resistance must be equal to the source ...
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1answer
43 views

Switch off branch of a circuit when voltage is present in another branch [power path management]

I want to convert a circuit that runs on 6V DC (from an intermitent power source) to a battery-operated one, by adding a Sealed Lead-Acid (SLA) battery. This would fulfill the following scenarios: ...
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61 views

Better polarization for push-pull

I have a circuit that used to drive a lighter load. I need to increase the current it manages to drive (and mainly the turn off time). In the following schematic I show what I want to do: the old ...
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3answers
638 views

Npn transistor failed to work

Sometimes after long time working correctly and turning on and off inductive load, Darlington NPN transistor (ONSEMI BD679) which should follow signal (IN4), fails to work and turns on inductive load ...
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3answers
90 views

Implementing a constant current source circut that can be switched off by a voltage signal

Does anyone know how to implement a constant current source circuit that is able to output 10mA constantly, ideally the load of the circuit would be a 100uF capacitor in series with 100 Ohms. Is ...
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1answer
53 views

High voltage loads best practice [closed]

I am on a learning curve to gain updated knowledge of 1.5 kV MOSFETs and IGBTs and their drivers, flyback transformers and the many ways of generating and switching high voltages. My question is what ...
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0answers
58 views

Chinese CC adjustable load microcontroller

I've bought recently a cheap adjustable load from AliExpress (see link). For the price, it's really decent. I use if to test LiPo batteries discharge. All in all, I'm really happy with it, but it ...
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44 views

Does parasitic capacitance increase the load value of electrodes?

I'm reading Samsung Display's patent about a display notch. In this patent, the inventors say that providing a parasitic capacitance to scan lines increases their load values. Can anyone tell me why?
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1answer
361 views

What is a load current?

I was trying to calculate the voltage drop of a copper wire due to its length, given that it has a fixed size and it transmits DC current. Anyway when trying to calculate it with one of this online-...
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1answer
43 views

How to read data sheet to get the time diagram of the outputs

I would like to know how one can read and obtain the outputs for Qa, Qb, Qc, Qd, using this data. On the third line of the truth table, what does it mean when the outputs for Qa is a, Qb is b etc ? ...
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17 views

Reason for parametric variation in a power system

Let us take an example of a single area power system consisting of a governor, noon-reheated turbine, load and machine, droop characteristics. It is written in the literature that ...
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1answer
41 views

Best way to handle switching supply minimum load

I am using a meanwell rid-85B switcher to power a legacy device that puts 3 kinds of load on the 24V supply. at startup, 1A, and at steady state, 0.1A, occasionally 0A. the specs on the supply want ...
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1answer
45 views

How to determin the load requirement for 24V DC power supply

I'm working in automotive industry, I got a project to add extra hardware to particular line. hardware actually requires 24v 70w. Now, we have a Power supply unit "power one he-24V-7.2a" in the ...
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2answers
65 views

Electromechanical or Solid State Relay Low Duty Cycle 1/2 HP Motor

i'm hoping someone can help me decide the best relay (in my scenario) for controlling a 1/2hp inductive load from 110-120v motor. I've spent numerous days researching this and hoping someone with more ...
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3answers
148 views

Controlling 13 outputs with a mcp23017 or 74hc595 and two uln2003?

I need to drive 13 20ma (constant) loads with a single microcontroller with only 5 available pins. My first thought was to just use a mcp23017 or some 74hc595's but after reading the datasheets it ...
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1answer
55 views

Why can the loading resistor and capacitor let the unloading waveform become from negative to positive voltage?

Fig(1) is part of schematic,and it generate a sine wave .Fig(2) shows two waveform which are with load and unload,i can understand that these two waveforms will be different because of loading,but why ...
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208 views

Single phase heater loads on 3 phase supply

I have two single phase heaters (same rating) that I have to connect to a 3 phase supply. Say for example the rating on the heater is 1000W, 208V. And the supply is 208V,3phase,60Hz. I connect heater-...
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2answers
773 views

Why induction motor draws more current when load is increased?

Please forgive me if I'm asking something already answered but I couldn't find specific information on this one. I am aware that a coil has inductive reactance when powered by AC besides the ...
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1answer
76 views

Adding a temporary load to a power supply

I have an isolated switching power supply which takes in 30V and outputs 55V 1.5A. It's a power source for a PoE+ powered device. When the device which is supposed to be powered is not connected (via ...