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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111 views

I do not understand this sentence: “Resistor is used to stop loading the transistor”

In this circuit, resistor R4 (just before the transistor) is used to stop loading the transistor. I do not understand the part "resistor used to stop loading the transistor".
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33 views

How does a boost converter power the oscillating circuit and load at the same time?

so I've put together a boost converter circuit of my own and I have a problem, I want my boost converter to output reasonably high current but whenever I connect a high current load - the astable ...
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45 views

Bleed resistor with a load that can be turned off

I have simple AC to DC 40 W, 18 VDC power supply with a bleeder resistor to drain the caps. However, the load can be turned off of independently of the power supply. This means the bleed resistor ...
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40 views

BJT Differential Amplifier with active load Analysis

I completed the theoretical parts of DC and AC analysis. I want to test them with the simulator. Both DC and AC analysis failed. I killed DC sources in the AC analysis section and I short-circuited ...
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45 views

Single and 3-Phase Load Calculations

I have a probably obvious question about powering single phase loads from two legs of a 3 phase supply and how this impacts current draw calculations. This is something that is commonly done in my job ...
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74 views

Turn LED OFF when load is disconnected

Link for the System This is my existing system, I would like to Add a LED indicator which will turn off when the Lamp get burned/damage. Someone told me to use transistor but am not sure which ...
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29 views

Adding Parallel Diodes to a load

This question is based on my previous question - Measuring voltage drop across a diode in a switched circuit I have started a bounty on that question. At the same time, I am trying to understand why ...
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30 views

Behavioral current sink in ltspice

In order to simulate a wireless sensor in ltspice, i need to model a load which draws 25mA current for 1sec every 10 min. Rest of the time it draw 40uA. Is there any way to do that?. I tried ...
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49 views

Impedance Matching between Source and Load

I am having this basic doubt In the basic crude basic block diagram, we have a source, transmission line and load, all having an impedance of 50Ohms. But according to maximum power transfer theorem, ...
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22 views

Auto disconnect the load while charging the battery

Here is a tentative schematic that would use the battery (3.7V, 3500mAh single 18650 battery) to power the load under normal circumstances. The charger is disconnected at this point. When the AC-DC ...
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60 views

Two 200V outputs on 1 DC electronic Load

I have a product with two 230V outputs. I want to test if the product is also working correctly under high load(2kW on each output) I have an electronic load with 1 output. Can I just connect both ...
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43 views

Why is the load a resistive load, not an inductive load when I measure the current and voltage of the transmission line?

Question: Measure the transmission line of a substation. The relation between voltage and current is that the current lags the voltage for 180 degrees, so now I want to ask Which part of ...
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45 views

Adapter load switch MOSFET schematic questions

I have a few questions concerning a input adapter load switch schematic for a battery charger IC (bq25780S). I posted a screeshot of this part of the schematic from the reference design (BQ24780S ...
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51 views

Capacitance multiplier with voltage regulator

I am trying to make a low noise voltage regulator. My concept is to use a symmetrical regulator using LM338 followed by capacitance multiplier (ESP version). According to Rod Elliot from ESP, the ...
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48 views

Overloading buck regulator

I'm having a hard time explaining to myself why the output voltage of a buck regulator drops at the load when the load pulls more current than the max limit of the buck regulator. Can someone help ...
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3answers
71 views

what is the load line and operating point used for in practical?

I have a hard time understanding what an operating point and load line represent and why do we need them at all. After reading some wikibedia, What I got is this load line represent response of the ...
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75 views

Voltage Reference Resistor Calculation (Shunt)

I am trying to design a circuit using this LM4040-5 Voltage Precision Reference for my DAC8554, but I can't for the life of me figure out how to properly calculate the resistor value to be applied. ...
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65 views

How do I power many devices off of a low voltage microcontroller?

I'm new to electronics. I have a GENIE 08 microcontroller, and I want to control multiple LEDs from one pin, and a few buzzers from another, and an LCD from one too. I am worried that the power ...
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50 views

22mA dummy load

Welcome all. I have system with 5.1V PSU sourcing 20mA. My load is circuitry running of 5V sinking 15mA to 18mA. However, in extreme condition my load sinks 22mA. I need to test each PSU to see what ...
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12 views

Soft latch power switch using load cell as switch? (low power consumption)

I'm trying to make a (weight) scale turn on by "stepping on" it. I have managed to make a working scale using an HX711 module with a load cell using an arduino. It displays the weight on a 1602 lcd. I ...
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57 views

What is the effect on power grid when utilization goes down some threshold?

Today (April 5th, 2020) at 9:00 PM IST, people across India are expected to switch off lights for 9 minutes. This has apparently raised concerns that there would be problems to the power-grid, due ...
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73 views

How to prevent current and voltage fluctuations for loads connected in parallel to the same power supply?

I have a 12V dc power supply/battery supplying a class D audio amplifier, 12V dc linear actuator (controlled by raspberry pi through an h-bridge), LCD screen and LED light strip (Lighting intensity ...
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81 views

How to calculate maximum power when value of load resistance is unknown?

Once again same circuit and same voltage source / current source and resistances. However now I need to calculate the maximum power that is consumed by the RL. How do I do that, and most importantly ...
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67 views

How do I calculate load resistance?

I'm here with yet another problem. This time I can't figure out what the question wants. I've calculated the Thévenin equivalent, however I can't work out how I should calculate the RL. Is the load ...
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21 views

Load sensing relay/power switch/adapter which switches on when it detects some load on its input

Complete newbie here. I'm not using the right terms, so my apologies in advance. The problem is simple. I want my powered computer speakers (2.1) to turn off when the computer is turned off. I have ...
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36 views

Calibrate for an inaccurate 50 ohm load in a DIY Vector Network Analyser (VNA) based on a VSWR RF bridge

I have built a "DIY VNA" using a frequency generator, an SDR receiver, a RF Reflection Bridge and a 50 ohm load. This is used to measure "VSWR values" of antennas to see what frequencies they are ...
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34 views

Can I run this circuit with only one AC line in?

I had a problem hooking up P2634 Velleman Quad Triac Switch card today and vaporized the trace between the Positive VAC and the outputs (denoted by the red lightning bolt in the picture). I didn't ...
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1answer
48 views

Drop-out voltage at the input using MOSFET

Please have a look at my below circuits. The first one is an MOSFET. N-MOS. Gate is fed with a function generator input of 5V peak to peak. 1kHz frequency. 1ms period. 90% duty cycle. Drain is ...
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1answer
41 views

Capacitor Voltage Hold up (During Input Power Interruption)

I want to understand how long a capacitor can provide the stable voltage for a given load current, in the event of an input voltage interruption? Suppose, I have a single 100nF input capacitor at my ...
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1answer
43 views

Switching Inductive load with SSR on 240AC

I am working on building a kiln (approx 7.5kW) and am using a PID to control an SSR that drives a heating element I made from Kanthal wire. The problem I am having is that the heating element is a ...
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1answer
67 views

overcharging issues in MPPT solar controller with NO output leads

My MPPT solar controller has no output leads. It contains only the (+,-)leads for battery and solar panel. Input is from the solar panel and output goes to battery.Therefore, I have to connect my load ...
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1answer
54 views

Create variable mechanical resistance to dynamo spinning

I want to make a system with a dynamo where the dynamo can be made harder to turn (as a fitness device) and I want to be able to use an electrical signal from an arduino or similar to control the ...
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1answer
121 views

Load resistor on (very) old toaster circuit

So the other day, my family toaster which is roughly as old as myself (25yrs), burned down. When I took a look at the circuit, I found out that some components melt down completely. One of them is (...
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186 views

What happens to the electrical grid when I turn on a heavy load?

I'm trying to understand exactly how an electrical grid works, and I'm having one simple question that is challenging me. What happens when a new load appears on the grid? I know in practice that any ...
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3answers
103 views

How is this load able to perform any useful work other than heating?

Consider a voltage source with some internal resistance, in series with a load. It turns out that the voltage source produces a power equal to \$I^2R_\text{total}\$ (this can be seen by using P=IV and ...
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2answers
74 views

How are series connected batteries of different voltages (or even same voltages) charged “equally”?

I am trying to understand conceptually, how a series bank of batteries is charged "uniformly". Let's take the example of of six 6V AGM batteries for a 36V golf cart. The charger is 36V nominal but ...
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59 views

Single phase neutral current & three-phase neutral current with respect to kirchhoff's law

In the below schematic, would be the sum of all current in the single phase neutral wires equal to the current in neutral wire going to the 3 phase main disconnect? In theory, we know that if the 3 ...
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1answer
45 views

How can I roughly estimate the load in this case?

A DC device operates with three industrial AA batteries meaning 1.5V times three = 4.5V. Besides that I only know that the approximate operating time is is 4 hours. Is that possible to estimate the ...
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42 views

DC Electronic Load in Constant Impedance Mode

I have an Electronic Load module that allows the UUT to be loaded in either Constant Current (CC), Constant Voltage (CV), Constant Power (CP), Constant Resistance (CR) or Constant Impedance (CZ) mode. ...
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61 views

Bulk power markets hour ending convention why?

Is there an engineering explanation for the hour ending (HE) convention common to US Independent System Operators (ISO)? For example, hover over any MISO real time market data and they will show the ...
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176 views

Can a 12V AGM battery be damaged by too light a load and relying exclusively on a 10.5V low voltage cutoff?

A problem I have with 12V power inverters is that they are set to give a warning beep and/or shutoff at about 10.5V (1.75V per AGM cell). This is supposed to protect the battery from overdischarging, ...
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2answers
132 views

Inductive and resistive load current draw - PSU

Below schematic is a simplified version of a power supply: simulate this circuit – Schematic created using CircuitLab When the voltage is set to 12V and current limit is set to 100 mA and ...
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2answers
69 views

Testing a power supply without hooking up its intended load

I have a PSU that I would like to verify and see if it is outputting all of the correct voltages. It's an old computer PSU from 1990 with a specific form factor that cannot be easily replaced with a ...
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2answers
54 views

Removing the load of an AC signal to a DC signal

simulate this circuit – Schematic created using CircuitLab I built this circuit to visualize music with LED's using a full-bridge rectifier I got from a vacuum(meant for 120VAC to 120VDC, with ...
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1answer
33 views

How to calcuate thevenin voltage with two voltage sources

In the following problem, calculating Thevenin's resistance is simple enough , 0.1 ohms. However I cant seem to calculate the Thevenin's voltage when there are two voltage sources? How could I apply ...
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50 views

How does adding a capacitor change the frequency response of this inductive LPF?

I know that a simple circuit like this in an ideal case will have a frequency response of a single pole LPF, where the cutoff frequency is given by: cutoffFreq = 1/(twoPi*L*2R) This is reviewed here....
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64 views

load of an outlet [closed]

I have an incubator with an internal outlet that, according to the manual, "can provide a maximum of 1A". I'm trying to understand if this actually means that the maximum load is 120Vx1A=120W? In ...
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48 views

Triac Switching Circuit

I will switch an ac load with a triac. I am providing a dc voltage of 5V on the gate of first Triac and 0V on the gate of second Triac. In the first picture the triac is working and the switch is ...
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60 views

Voltage increase with capacitor… what's the “true” voltage?

The board on an old battery charger went bad, but the transformer was good. So I've got about a 12.3VDC output when I connect the transformer to a bridge rectifier. However, if I decide to wire in a ...
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50 views

Load RMS voltage of a bridge rectifier

I was given a homework assignment shown below and I have a few quick questions that I appear to be stuck on. Any help would be appreciated. I can get Part i) and the answer is 168.64 degrees. Part ...

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