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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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37 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
112 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
38 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
48 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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59 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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96 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
161 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
103 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
60 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
67 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
35 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
86 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
37 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
58 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
80 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
39 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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0answers
50 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
616 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
80 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
52 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
57 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
170 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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0answers
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
42 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
51 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
103 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
52 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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1answer
153 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
375 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
75 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 ...
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1answer
127 views

Load sharing between 3.3V regulator and LiFePo4 battery

I am trying to design a supply for a relatively low power (<100mA) device with a LifePo4 (14500 format) battery and a USB input. Everything is running at 3.3V, and therefore I would like to avoid ...
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4answers
930 views

When transformer rating is in kVA, why load is mentioned in WATTS?

The transformer rating is given in kVA, but the load connected is always considered in watts. Why? Eventhough, the load active power is represented in watts it has some reactive power, right? Is ...
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0answers
31 views

Battery Stack Switch

I have been brought to the community for a design opinion/suggestion. I have two 10.8V batteries that must be normally connected in series. When 24VDC from a power adapter comes in, these batteries ...
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2answers
155 views

Can any type of op amp output stage be forced into Class A operation?

I'm trying to choose a good op amp for a Class A small signal audio amplifier circuit. I've done my research and understand the use pull up or pull down resistors externally to force Class A ...
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1answer
115 views

What is the purpose of this FET load?

I'm used to seeing a load resistor in the place of the yellow highlighted (Q2) section of this FET amplifier circuit. This is the input section of a guitar overdrive effect, so any distortion created ...
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1answer
71 views

Building a numeric potentiometer for AC current

I'm building a bench to calibrate a device that measures AC currents. As I won't build something accurate, the current will be measured with a current clamp and a multimeter (voltage mode). For the ...
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0answers
32 views

Will this battery bank circuit work with these batteries?

I took these batteries out of an old laptop battery pack: It's a parallel array of four 3.7v lithium-ion cells (it was originally used in series in the laptop). Each one is at 4.2v. I tried to ...
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1answer
64 views

How a current buffers works, I want to make (1-5)V to (4-20)mA V-I converter, how can I make this circuit load independent?

I want to make a 1-5V to 4-20mA Voltage to Current convereter. I choose this circuit. The circuit is working for only 250ohm load the conversion ratio is 4. But I want to make this circuit load ...
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0answers
264 views

How to plot an impedance vs frequency graph in Proteus?

I'm designing a circuit that simulates the impedance behavior of a real world speaker, which is not purely resistive and looks something like this: I already got the basic circuit but need to tweak ...
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0answers
58 views

sinusoidal back-EMF is the voltage under armature current load or no-load operation?

For the design of sinusoidal permanent magnet AC synchronous motors, it is important to make sure the back-EMF as perfectly sinusoidal as possible to smooth the torque generation. During the motor ...
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1answer
87 views

Off-load voltage of wall-warts

I need to regulate an incoming DC supply from a wall-wart down to 5 volts. I'm experienced with designing power supplies with ordinary transformers. In this situation, the maximum voltage I can expect ...
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2answers
206 views

OpAmp with high output current and capacitive load

I am trying to solve the following problem which - until today - I thought to be a trivial one: I have multiple reference voltages (from different sources) that I need to buffer and/or invert, filter ...
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1answer
236 views

Buck converter without load - is it dangerous in long term?

As a followup to my previous questions (Q1 - circuit diagram is here, Q2). I disassembled the LED bulbs, cleaned and resoldered the components on the DC-DC converter boards, replaced caps, and ...
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3answers
82 views

Can a Li-ion battery be discharged in CV mode?

I have a load which can also be set to "Battery test". I can easily discharge a Li-ion battery using the CC (contant-current) mode, which is also a condition recommended by the manufacturers. For ...
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1answer
39 views

Input voltage drop [closed]

I have a circuit, the characteristic of the load is unknown, most probably resistance and capacitance, the input for the circuit is %v and frequency is varying from 10 Hz to 30 MHz. once the input ...
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3answers
225 views

Output voltage of an amplifier circuit

I found this note on a devicesheet: I'm asking about the output current: How can we fin Iload = Vout/(RS*R2/R1) ? For our example, we will take Vcc = 3V, we call Va the node crossing R1 and RS wires....