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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62 views

Load sharing MOSFET selection

I have 3S series Li-Ion batteries and load sharing circuit. Like this link Sorry one-cell is shown in the figure but I have three-cell battery instead of one. How can I specify suitable P-channel ...
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66 views

SMPS Pre Regulator Minimum load

I am designing a 30 V 5 A lab bench power supply having SMPS as a pre-regulator for the linear stage which will keep the SMPS output always 4 V higher than the main output voltage. This means SMPS ...
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45 views

TRIAC control of inductive load. Current ringing at higher power causes TRIAC to remain on

Here is the circuit I am using to control the motor. L2 is meant to represent the motor and C3 is the capacitor that comes with the motor. It is a single phase AC motor found here. This circuit is ...
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25 views

Internal EMF of a Synchronous Generator Relationship with Load side line Voltage

Say you have a 6-pole, star-connected, 60 Hz, 25 MVA rated, 600 V synchronous generator. After conducting open and short circuit tests you get the equivalent circuit with Xs = 600/(root(3)*14000) (...
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47 views

CMOS active crystal oscillator load capacitance, to be used for PLL reference

I do not have a clear idea of what load capacitance is. I am looking forward to use the ADF4106 PLL with a ~580 MHz VCO to synthesize the frequency. For the reference input to the PLL, I wanted to ...
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41 views

How to calculate portable power station draining with other loads?

I want to buy a portable power station, it's basically a battery, the battery capacity at 14.8V/15Ah is 222Wh, I want to know how many times it will long for some loads, such as a simple light , or ...
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26 views

Capacitive load in inverter

I'm trying to understand the effect of a capacitive load at the output of an inverter. And how does it affect the output signal when this capacitive load is high and when it is low? Could anybody ...
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2answers
185 views

Relationship between antenna impedance matching and gain

This is my first year designing and simulating antennas and I try to understand the relationship between impedance matching and gain. I stumbled upon the term of antenna efficiency which makes perfect ...
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1answer
68 views

How much to increase crystal load capacitance based on this inaccuracy?

The frequency of my 40MHz crystal is 10.6 ppm high, how much should I increase my load capacitance? I am using 12pF crystal with 15pF load caps. As I understand if caps need to be unbalanced the ...
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35 views

Battery voltage drop on load (speaker amplifier)

I have recently built a Bluetooth speaker. It is working well, but there is a problem when playing on high volume. The speaker has 2 parallel 18650 batteries for a power supply. I used booster modules ...
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2answers
54 views

MIC2251 5V Booster - voltage drops when load is connected

I have a step-up circuit that boosts 2.8-4.2V on the input to 5V. The problem is when I connect any load to it at the output, it loses around 1V and I have no idea why. The Step-up IC is MIC2251: ...
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SLA battery under load: Is the absolute voltage or the state of charge primary for wear avoidance?

When an SLA battery is under load, they say not to go below a certain value to avoid wear. So, don't go under 30% State of Charge (SoC), which is also a certain Open Circuit Voltage (Voc), say 11.8V . ...
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26 views

Power a circuit with with 12V barrel jack and USB 5V

What if I use a Schottky diode at both the power rails in forward voltage mode and connect both the supplies? Will it damage my circuitry? Reverse current will not damage my device because of the ...
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1answer
58 views

Using two USB 5V sources to toggle a AC relay for a hibernating computer w/ high phantom load

I have a PC w/ a great processing-to-power-consumption ratio, however its idle consumption and power-off power draw (phantom load) is far from ideal. I could use an external switch to manually toggle ...
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1answer
68 views

How can grid frequency dropping lead to grid failure [closed]

From what I understand, frequency variation indicates generation-load imbalance. In particular, when frequency decreases the load demand is greater than generation. Wouldn't this just lead to the ...
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48 views

Adjustable MOSFET dummy load to drain PSU negative side (-12V)

I have a mission to build a dummy load to make a PSU test and found some schematics with a positive load. It worked like a charm. Electronic load, Problem turning MOSFET on But there is no information ...
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1answer
88 views

Estimating load capacitance when connecting two opamps?

I plan to use the OPA657 as a charge sensitive pre-amplifier for measuring the output from a reverse biased PIN photodiode. I would like to further amplify the signal using a wideband EL5163 opamp. ...
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What load resistance will result in maximum power transfer - Art of Electronics

I am reading Art of Electronics book. There is a question: Here is an interesting problem: What load resistance will result in maximum power being transfered to the load for a given source resistance?...
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3answers
158 views

Is there a way to somehow "isolate" a voltage drop?

I have a small issue with voltage drop. I'm working on a project, where I have five resistive wires (approx. 8 ohms each) connected to li-ion battery pack in parallel. The battery pack outputs 16.8V ...
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48 views

Uneven Brightness Curve When Using Digital Triac Dimmer on Neon Transformer

I am working on an AC dimmer project using the following circuit: This circuit functions by detecting zero crossings in the AC power input via the LTV814 optocoupler connected to a pull-up input pin ...
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33 views

Reactive power doesn't add up in load flow analysis

I am doing a load flow analysis as part of my coursework in MATPOWER and need help figuring out the mathematics behind the bus data in the third table below. Basically, the three generators' real ...
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2answers
83 views

What happen if one connects two live phases together? [closed]

If a house is running on 1 phase wire and is flipping instantly or not stable for a short period as it drops from 200v to 170v and return back to 200v in 10 seconds. Would connecting another phase to ...
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1answer
31 views

PV operation points due to load changes

I couldn't find anywhere what happens to the operation point of a PV cell, when, a resistance (load) connected straight up its output, changes (step) from one value to another. With other words, ...
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32 views

I wnat to design a circuit with a DC load but need help calculating the required circuit breaker, cable etc on the AC side of the power supply

I need to design a circuit with a knowing DC load of 24Vdc 20 watts. Now I have a Puls PIC 120.241D power supply that I can use. My question is I need to spec the protective device on the incoming ac ...
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59 views

AC to DC power calculations? [closed]

I have an ac to dc power supply and it measures at 244.0Vac on the primary side and the secondary side it is reading 21.34Vdc. I attached a load to the secondary side that is drawing 0.390amps and ...
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3answers
74 views

Inrush control transient at power on

I have a circuit with a not-so-small capacitor on the supply and I need to reduce the inrush surge; as a matter of fact the power supply breaks after a while (these cinese supplies are not fun) I ...
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2answers
53 views

How to control the transient output current of a synchronous buck converter?

I am dealing with the following problem, I want to control the output current and voltage of a synchronous buck converter during the output load (resistor) step change. Suppose we set the output ...
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1answer
56 views

Adding mods around a TP4506 (Led indicator + use load while USB plugged)

This is my first post here, I'm looking to achieve some modification on my GBZ power part. I'm currently using: LiPo Battery 3.7V 4000mAh Micro USB charger TP4056 MT5608 Volt Booster (output 5V) I'd ...
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1answer
57 views

Solving for phase currents given line currents and line voltages in 3 phase unbalanced delta load

I am given the line currents and the line voltages for an unbalanced 3-phase delta connected load but need to solve for the phase currents on the legs of the delta load. I know that: $$I_{L1} = I_{a} ...
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1answer
52 views

What happens when an electrical load is supplied to a motor via a switch and the motor doesn't turn?

I'm not from an electrical engineering background. But I'd like to understand what happens when I have the following: Electrical 'main power' switch ------> 'small switch' ------> electrical ...
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2answers
80 views

If I put an L298N between a 12V source and a 100W DC fan, what will happen?

The L298N stepper motor controller module has a driving current of 2A ("MAX single bridge", not sure what that means) and a maximum power of 25W. I don't understand what those power limits ...
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2answers
61 views

System load vs. hourly system load (HSL)

Real-time electricity usage in Texas is graphed by ERCOT, the Electric Reliability Council of Texas. Today's graph can be found here, with a screen-grab below: Note the difference between the lines ...
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1answer
35 views

Angle difference of source/load for real power flow

simulate this circuit – Schematic created using CircuitLab Suppose Vs = |Vs| (angle 0) and Vload = |Vload|exp(jθ). 'Because Vs has an angle of 0, θ must be negative in order for real power (P) ...
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36 views

DC on-load switch (with overload and short circuit protection)

I have an application where I shall switch a DC load ON and OFF (with DC input), but have also to provide overload and short circuit protection. Switching voltage is 400VDC and the load is 2KW. I need ...
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37 views

Load frequency calculation of quartz with its load capacitance

After web researches and a first discussion about general comprehension, I am a bit lost with the load frequency calculation: I see a design which uses two 33pF external capacitors (C1 and C2),with a ...
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39 views

12 load sensor digital scale?

I have a unique need for a custom, foldable scale and I'm having a tough time narrowing down the components needed. My search on how to get this done has brought me here to this community. Essentially ...
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0answers
9 views

Installing 4 ploe Rccb

Could I install 4 pole RCCB for unbalance 3phase load (like residential building) ? How does 4 pole RCCB work? Thank you.
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70 views

Does creep always occur with load cells, or is there an optimum weight capacity?

I want to make a scale which I will place under a wood stove (downdraft gasifier) to measure the amount of wood that goes into the wood stove. The amount of wood which is being measured will be ...
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41 views

Switch load using toggle switch or switch button

The fact is after designing my own dc-dc converter (0.8v-20.5v 5A max) I decided to add a switch load button in order to connect/disconnect the load only after setting my desired voltage. I could use ...
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1answer
57 views

Generate 1W load on 240V mains to calibrate power meter

I need to measure the accuracy of a mains power meter at around 1W. How can I go about it? Despite being clueless about electronics, I do have some a Tektronix PA1000 Single-Phase Power Analyser that ...
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0answers
49 views

Solution to prevent load from drawing the current from battery while it is charging and draw it from charger instead

I have the following problem: I have a 12.8V LiFePO4 Battery that powers the circuit and a lead acid charger with Intelligent MCU Control of 12V and 1.5 A to charge the battery. When the battery is ...
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1answer
41 views

NFC tag antenna detection without a NFC chip

hope that you are good. I need to build an application to detect NFC antenna without NFC passively power chip. As we know that we can detect NFC tag by power the NFC chip inside this tag then it ...
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3answers
109 views

Photovoltaic system that charges a Li-Po battery while supplying a 1.4V load

I am a mechanical engineering student and not that familiar with electronics. I am currently trying to establish a photovoltaic (PV) system that can charge a 3.7V 100mAh lipo battery and deliver ...
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35 views

What device has high inductance? For example >1000mH (for 220Vrms 50-60Hz output) [duplicate]

What devices have high inductance values (for example >1000mH?) What I found in a real device (for example induction motor) datasheet is just near <1000mH (on rotor and stator.) Is there ...
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2answers
113 views

Why are standalone MOSFETs and transistors preferred over integrated load switches?

As a novice to EE concepts who's trying to apply it to Arduino projects, I was doing hours of research on how to electronically switch another higher current (or voltage) device/component/subsystem on ...
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2answers
169 views

The voltage becomes zero when the load is connected [closed]

This is my circuit. When I connect the load of 10 Ohm, the voltage goes to zero! The voltage goes to zero even if I put resistor of 10 kOhm.
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2answers
48 views

Does the lm317TG require a load resistor in the final design or just for testing?

I'm building variable voltage regulator, the regulator has levels of 9, 12, 15 and 18 volts and a potentiometer that allows for incremental adjustment between the levels, so at level 18v you can drop ...
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1answer
48 views

How can I calculate current with load switch? [closed]

I want to use a load switch for protecting my PCB. I also want to watch/measure the current drawn by my board. How can I sense/measure the current drawn by my board, using a load switch like the ...
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1answer
186 views

What is meant by static and dynamic loads in electrical drives?

What is the definition of a static load and a dynamic load when it comes to electrical drives? Can someone give some examples for both types of loads?
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4answers
113 views

„Power circle“ - first buck then boost for converter testing

I would like to test the efficiency of some buck converters. I am thinking of using two current sensors like INA219 (or similar) connected to an Arduino and using the serial monitor to gather data. ...

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