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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18 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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21 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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24 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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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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39 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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38 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
54 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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44 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
31 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
83 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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33 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
90 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
125 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
47 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
38 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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40 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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88 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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60 views

Why does power driven to the load has this expression?

I'm designing an oscillator, I'm using as textbook Krauss one. I would like to design the oscillator In function of the power it must give to the load and the fundamental frequency. I have seen this ...
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1answer
44 views

What is the equivalent capacitive load seen by the IC if in a datasheet of a chip CLmax=10nF given and I connect an RC filter as a load?

I have a stupid question where in the quick, the answer does not come into my mind. If in a datasheet of an integrated circuit, a maximum load capacitance is given, e.g. 10nF, and I want to connect an ...
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2answers
42 views

What happens when the motor torque is constant and the load torque suddenly decreases?

It is a situation where the load torque (Ta) suddenly decreases while rotating the shaft with a motor(PMSM) at a constant motor torque (Tm). In my opinion, the rotational speed of the shaft (I-moment ...
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1answer
41 views

Different chemistry of batteries in operation

I had an idea of using different chemistry of batteries as shown in the schematic figure Is that possible to design a system in that way. According to the design, I am using all the evaluation boards....
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1answer
47 views

How to determine preload resistance needed for an ATX power supply to power up?

I want to make a benchtop power supply from a 20 pin ATX power supply from the last millennium. I have seen posts, but still need help. So far, I have shorted PWR_ON to ground and have connected an ...
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4answers
195 views

How to combine wall outlets for higher amperage?

I have a large single phase AC motor that draws 30 amps at 125v. I only have access to NEMA 5-15R outlets (which are rated for 15 amps). However, several outlets are on different lines (different ...
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70 views

An impossible task? Reverse current/short circuit protection not only for load but also for power supply

This is a magnetic phone charger. It's a USB cable that plugs into a standard 5V phone-type charger. The magnetic "plug" has a (+) center-pin and a (-) round metal as the ground with a ...
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2answers
55 views

Multimeter as a variable load

I want to measure the current that can be supplied from a lead acid battery I have. (To know it's remaining current supplying capacity). To measure current I need to connect a load and an ammeter (...
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2answers
75 views

Surface temperature of a load resistor

How can I calculate the surface temperature of a load resistor? I'm given requirements that I may need a 1W 500 ohm resistor. During test fixture or product debugging the resistor is almost always is ...
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3answers
57 views

High-Side N-Channel MOSFET Driving

Is this an acceptable way to drive a mosfet? In this case, I'm trying to turn on a high current load, but in case the load is changing it's resistance/impedance, or in the possibility it's ...
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2answers
133 views

Suitable Half Bridge Driver to control capacitve load

I am looking for a method to reliably and quickly charge/discharge capacitors. Each capacitor should be individually charged/discharged. The charge/discharge rate should be in the microsecond range (...
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1answer
53 views

Connecting multiple loads to an extension cord

We have a garage at our house and whilst there is electricity going to it, it's basically just one outlet connected to our second fridge/freezer via a 15A extension cord. I was wondering if it would ...
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1answer
31 views

In a transformer, how do you determine where the induced EMFs (E) and voltages (V) are placed in a vector diagram?

I will be citing pictures from Electrical Technology by Theraja. So there are different cases with regards to the transformer depending on what losses and loads are considered. Each of them have ...
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1answer
74 views

Reason to connect a bidirectional tvs diode in paralell with a unidirectional one

I am designing my own high-side smart load switch for my power supply using TPS27SA08 ic. I decide to investigate how it works this evaluation board https://www.ti.com/lit/ug/slvubd4b/slvubd4b.pdf?ts=...
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24 views

how does power load sharing work when power supplies have different/variable capabilities/capacities?

I work with large networking gear fed by multiple AC->DC power supplies. One of the modules we use takes multiple AC inputs, when both inputs are active the module can supply 6KW of output DC ...
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1answer
59 views

LED Spotlight array issues

I am making a "lightbar" for my vehicle which consists of 7x 6" diameter spot lights linked together. The specs for each of the individual lights are below: LEDs: 14x 3w OSRAM Max ...
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1answer
62 views

Is a VL3030 a suitable replacement for a ML2430

Hi i am attempting to replace a battery in my electronic compass and im supposed to use an ML2430 however this is proving to be hard to get hold of and expensive. Im concidering using a VL 3032/HF5N ...
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25 views

Load/Shunt resistor value calculation for DC-DC Converters

I have DC-DC converter with rating -4KV and 1W. The unit supports current monitoring of output voltage. I would like to test the current monitoring using shunt resistor. What should be the rating of ...
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42 views

How to make a synchronous generator unstable

I was try to analyse what factors can affect the stability of synchronous generator . Let's say a synchronous generator working in isolation and some loads are connected to it and we have to make it ...
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2answers
33 views

Motor Mechanical Torque vs Motor Electrical Power

Let us say there is a constant load which is driven by a geared 3-phase ACIM (AC Induction Motor) of 5kW power rating. The mechanical load and its speed is constant. If I would need to replace this ...
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1answer
100 views

How bad is it to momentarily overload a transformer? [closed]

I have an espresso machine from the US running on a transformer in the UK. Inside the machine there is a grinder, a pump, and some heating elements. The machine is labeled 120VAC 1150W. I have it ...
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39 views

Steady State speed of rotor in following doubly excited system

I'm trying to analyse following system - A three phase armature winding on stator and on rotor field winding and both stator and rotor are cylindrical . And armature winding is connected to a three ...
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40 views

DC motor, confusion in specification about Current

So, I am trying to build a little robot mower, and getting all parts. So I recently buyed two DC 12V motors, here is the specs: Now I am trying to calculate how big or which battery should I use, and ...
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1answer
65 views

Is there a mathematical representation that represents the output voltage of a buck or boost converter in discontinuous mode?

Recently I have learned that in buck or boost converters, the output voltage depends only on the duty cycle and input voltage in continuous conduction mode or when current is continuous. However, in ...
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25 views

Naming the circuit of a PV-cell

I've recently been attending a solar-engineering module at university, however, I'm not on an engineering course so this module is completely new to me. This was shown on a lecture slide, however, the ...
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31 views

common circuit to turn on/off ac motor of 110V AC or 230V AC using MOC3041 and BTA16 Resistor calculation

I am building a common circuit to turn on/off ac motor of 110V AC or 230V AC using MOC3041 and BTA16. How do i calculate both resistor value R and Rg ( With Wattage ). For accurate control of TRIC. ...
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26 views

How does changing the inductance, capacitance and load in a buck or boost converter affect the circuit?

Before anyone calls me out, yes I am asking electronics related questions due to homework but honestly I am able to answer some of them. There are just some that I need StackExchange insights. For ...
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18 views

How to power multiple microprocessors and loads for a modular system on single bus?

I am considering high-level design choices to build a modular system. I want to make a single design of a microprocessor board that can be connected to identical copies of itself and share a single ...
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2answers
28 views

Measuring the capacity of a 40v lithium ion, lawnmower battery

I purchased a 40v Greenworks lawnmower battery, and it's listed capacity (6,000 mah) doesn't seem to be accurate based on what I'd expect to get out of it when mowing a lawn. How would you go about ...
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1answer
17 views

MDIO bus max fanout

I know that the maximum number of devices that can be connected via MDIO bus is 32. But how to determine the real maximum fanout of MDIO bus. I mean I have a PCB (6U size) that has AM335x SoC driving ...
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1answer
45 views

Best way to turn off P-FET with 3.3V available (P-FET Load Switch Application)?

honestly I'm drawing a blank. I am trying to turn on and off a load with a P-CH MOSFET. I used generic resistor values just to be clear. Now, in this example the VGS will clearly never go to 0. It ...
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49 views

How to connect a load to an amplifier without a loss in gain?

I have this circuit below, that represents a common emitter amplifier: When connecting a load of 10 ohms to the collector node and a signal to the base node there is a huge loss in the gain of the ...

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