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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How to do max load management or balancing at home? [closed]

In my house I have: 2 Air conditioners 2 Cooler 1 Refrigerator 1 Chimney 1 Submersible pump (1000 W) When all turned ON together they consume 5 kW power, I want to ask if there is any way to load ...
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Constant Power Loads in LTspice

Could someone help me understand what is happening in B1 when stepping between P = 2.9 W and 3.0 W?
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Port expander with high side switch ground dilemma

I have a design wherein the basic idea is to control individual LED strings and dim (analog dimming) them using Pi Pico via I2C interface. This board is the LED driver which will be connected to the ...
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2 votes
1 answer
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What is the loading factor of a generator?

Looking at an ENTSOE paper, I have seen this table in which the typical ''loading factors'' of different generation types are listed (see figure below). But, what is this???? I was supposing that it ...
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How to plot the reflection coefficent at the load against frequency in ADS

The reflection coefficeint at the load is defined as how do I plot the load reflection coefficent against frequency in ADS? it is easy to plot the source reflection coefficient since it is just ...
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8 votes
8 answers
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Can simple DC/DC linear regulators be used in parallel?

Can linear regulators such as the L7805CV (Rated at 5V output, 1A max) be used in parallel? I need to create 5V from 12V, but I need more than 1A, so a single regulator won't do. Can they just be ...
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Can I connect low-power resistors to achieve a high-power resistive load?

I've designed an 80 W 400 V PFC boost converter and I want to test it with resistive load. but I couldn't find a low-cost high power (20 to 80 watts) resistor in the range of 2k to 10k ohm. Is there ...
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Should the top torus of a Tesla coil be cut?

Dosen't the top load torus act like one turn coil in short circuit? Doesn't it "steal" (decrease) the energy transfer to the arc? As a load, it has an inductive reactance (1 turn solenoid.) ...
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Self regulating effect of loads for frequency control

How does power absorption from loads depend on frequency? I know that during a frequency deviation in power grid, there are primary reserves which control the frequency, but I know there is also the ...
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Load Factor from max demand/time graph

I know Load factor is average demand/max demand so is this then LF= ((20x4)+(40x4)+(70x8)+(60x4)+(50x4))/70x24
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Rated nominal power of generation with respect to load condition

In the electric power grid generation and consumption must be always the same. For sure the load change continuously in time, therefore an equal generation change must always correspond to the load ...
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Delayed switch (closed for three seconds then open)

I have server that won't power up. I found that if I connect a 50Ω load to the +12 VDC output of the power supply everything works fine. I only need this additional loading for about three seconds. I ...
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5 answers
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What determines the current flow in a load?

If we apply a load of 100KVA to a 100 volts source, we will get 1000 amperes of current through it. If we apply the same load of 100KVA to a 1000 volts source we will get 100 amperes of current in the ...
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What is the difference of meaning between the phase angle of S11 and the phase angle of Γ (Gamma)?

I realized recently that the Touchstone "DB" S-parameter format (.s1p, etc) uses the phase angle of \$\angle \Gamma\$ instead of \$\angle S_{11}\$ and wondered why it didn't use the phase ...
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Load impedance seen by op-amp

I have a question about the load impedance seen by an ideal op-amp output terminal in inverting configuration. When calculating the load impedance, we set Vin = 0; In one way I could say that the ...
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nature of the load connected to the electric power grid

I know that loads can be modeled either as constant impedance or as fixed power P and Q. I also know that the majority of the loads are constant impedance type but I don't know exactly the percentage. ...
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Can loads absorb more power than needed/requested?

I was designing the governor of a generator, implementing in Digsilent Powerfactory a 1 bus grid like that in the picture. The generator delivers 350 MW and the 3 loads withdraw respectively 25 MW, 25 ...
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Usually Geiger tubes have a recommended 1 to 5 megaohm anode load. What determines that value and what is the effect of increasing the value?

I think title is sufficient. Changes? Dead time, signal out amplitude, plateau character, etc.
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NiMH battery management

This follows on from a post I made about my front door (link at bottom of this post). In essence I have a door with a 12 V motor in it, which is activated by a 12 V pulse. The power supply is only ...
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Load sharing MOSFET problem

This is the schematic of the circuit: Power-supply1 is an external supply. Power-supply2 is a 3S Li-ion battery. AIM OF THE CIRCUIT: When an external power supply is connected, the load should draw ...
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Risks of variable power loads on an offgrid inverter (zero-crossing PWM)?

My goal is to regulate loads in my offgrid inverter-powered system. I moved to a fully offgrid house with batteries and a pure sine inverter. I would like to control how much I dump of my solar ...
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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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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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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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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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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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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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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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2 votes
2 answers
270 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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2 votes
1 answer
88 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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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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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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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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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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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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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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2 votes
1 answer
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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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3 votes
5 answers
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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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3 answers
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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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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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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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2 answers
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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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1 vote
1 answer
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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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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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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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1 vote
3 answers
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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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2 answers
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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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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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1 vote
1 answer
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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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