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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97 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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95 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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98 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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66 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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35 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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43 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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21 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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56 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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80 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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86 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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47 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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50 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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29 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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48 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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4answers
63 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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46 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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54 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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48 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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1answer
58 views

Is another diode needed when using a tip120 transistor?

I am using the circuit in the second picture, which clearly uses a diode. (Found here) However the TIP120 data sheet transistor already has a diode in the schematic symbol. Do I need to add another ...
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1answer
44 views

Charging battery with external charger while powering load

I am building a device which I would like to be able to charge with several different types of external battery chargers (different Icharge within spec of battery, of course). If I understand ...
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3answers
163 views

Question about ideal transformers and inductors

Recently I was studying about alternating currents and transformers and I got confused about some of the concepts. I tried a lot of sources but none of them seemed to address the problem. I ...
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2answers
88 views

Driving an audio speaker design questions

I have been dealing with some project in which I have some requirements to accomplish. For now, I am dealing with the first part and a quick story is, I have to generate a sine wave at a certain ...
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1answer
60 views

Connect a load switch to output [closed]

i have a 48V output. I want to connect a load switch to it so if i put a 3.3V signal to the load switch. the load on the 48V line will be 3A. I don't know how to do this correctly.
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How to suppress noise in my circuit

I illustrated what my circuit do as you see. Switching frequency is 800 Hz. When I increase the load, a noise is heard from my circuit. Here is my drain oscillocope view in frequency domain. What can ...
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2answers
79 views

In a half-wave uncontrolled rectifier with RL load why does the voltage spike when current reaches 0A?

I understand that the inductor creates a negative voltage to oppose the change in current but I don't understand why the voltage spikes up instantly when the current reaches 0A.
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47 views

USB-Battery load sharing circuit comparison

I have found two different load-sharing circuits on Adafruit modules: The 32u4 (left) only employs a schottky diode, while the nRF52 (right) uses an additional pull-down resistor as well as a ...
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1answer
112 views

555 timer to drive transistors with low load resistance

Recently, I have a project that needs to heat up a metal filament with a single pulse voltage. I built a circuit with 555 timer and transistors to heat up the metal filament(0.2 ohm). The circuit ...
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2answers
79 views

MEMS Oscillator not running, why?

For the latest iteration of my prototype, I replaced a quartz oscillator with (what I thought would be) a drop-in MEMS replacement: the DSC6013CI2A-033.0000. It is suppling a 33 MHz clock to a TLC5955 ...
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69 views

PMOS Load Switch Circuit issue

I'm working on a load switch circuit that drives a capacitive load of 1000 uF and a GaN transistor in parallel. The schematic of the circuit is attached. The input voltage is 50 V and the ...
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1answer
61 views

Load cells in Wheatstone bridge to produce logic signal

The goal is to use 4 units of 50kg load cells in Wheatstone bridge to act as a load detector. It should output a logic 0 or 1 if the load is greater than a threshold value. A MCU will read the states ...
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64 views

Driving Capacitive Load

I did a bistable multivibrator drive NPN mosfet using timer55 and my mosfet drive power LED. Our Load has 3 circuit stage which are emc filter + smps circuit + power Led. I have a problem at that time ...
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61 views

How to prevent capacitive discharge on my load after MOSFET off state

I built a button on off latch circuit using nand Gates then connected latched output to Nmosfet's gate with a resistor. My load is a smps circuit drives the power Led and this circuit has emc filter ...
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53 views

pwm half bridge inverter- split capacitor voltage alternating

In the half bridge inverter shown below, when driven by a PWM signal, the voltage Va (the voltage in-between the two capacitors C1 and C3) is a sine wave. I was expecting it to be a constant voltage ...
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43 views

Motor “load” for 8051 does not change based on 8051 GPIO pin

I implemented a circuit very similar to the following (original source: 8051 - Can an NPN transistor be driven? ) to control power to a vibration motor from my micro. I made the following ...
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1answer
54 views

Half Bridge Inverter Effect of Load on waveforms

I have made a half bridge inverter, in the lab and on simulation software. I have used the gate drive IR2110a and am supplying it with a square wave pulse and it is then applying the gate voltage to ...
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3answers
152 views

Electronic load, Problem turning MOSFET on

I am trying to make an adjustable dummy load to test a 12V supply, I’m having trouble with the op-amp feedback circuit. Attached is a simplified schematic. I have tried lots of things and stripped it ...
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1answer
86 views

Can a solar inverter be damaged if installed capacity is much larger than demand?

I had a dispute with my fellow. In his opinion, a power inverter can be damaged if the load is much lower (e.g 100W) than installed capacity (e.g. 10kW) of the solar system. I am of the opinion that ...
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153 views

Electronic load for negative voltage PSU

I am making a MOSFET based electronic load to test my PSU rails. Below is a simplified version of my circuit with V2 as the PSU that is being tested. I want to be able to test negative voltage rails ...
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2answers
130 views

Detecting when an illuminated AC doorbell is pushed

I have an 8VAC (can be switched to 12VAC if required) pushbutton bell which is in series with two "ding dong" chimes. The button is illuminated with an incandescent bulb, also in series. Pushing the ...
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63 views

Triac control circuit through load

Why is it that in every triac analog dimming circuit I find that the triac triggering circuit is fed through the load and not straight from the mains??
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95 views

Constant current load circuit? (20 amp) [closed]

I'm pretty new to stack exchange and I've only just gotten my basic circuit analysis classes done in college. For my school's solar racing team, I've been tasked with designing a constant current load ...
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2answers
104 views

Stove element as a resistor

I am wanting to use an inverter based TIG welder as a constant current power source for anodizing aluminum. The main hurdle I suspect I will be facing is that the amperage of the welder may be ...
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3answers
109 views

Can someone explain this constant current load circuit?

I'm currently a rising junior in EE and I was just wondering if anyone could help explain this circuit for me. The purpose for this is because I need to learn how to build a discharger (constant ...
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25 views

Issues due to sudden load disconnection/connection

I am working on a circuit (schematic enclosed) which is being powered by a high discharge LiSOCl2 battery. A TPS61232 based 5V booster powers two loads: LOAD1 is directly connected to the 5V bus ...
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3answers
95 views

DC Power Limiting Circuit

I would like to know how to build a power limiting circuit. The goal is to be able to combine two PSU's with the same voltage in parallel in order to increase the Power output. From what I've tested,...
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1answer
55 views

Common/separated ground in dummy load?

My question is simple - maybe silly. I've got 2 circuits: MCU with DAC, ADC and another 3.3V electronics Dummy load (Max 24VDC). Do I need to connect two separate grounds (MCU ground and dummy load ...
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71 views

Does a Microcontroller act as a Capacitive load or resistive?

I'm designing a unity gain buffer (IC MCP6002) and in the datasheet, it says that a small series resistor is required at the output, if the load is capacitive and is >100pF. The input of the buffer ...
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1answer
62 views

Power Contours for a Power Amplifier

I am having a bit of difficulty generating the power contours at a Pin where Pout is 17dBm. I am doing a PSS analysis in Cadence Virtuoso. I am sweeping the phase along with a parametric sweep of the ...
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2answers
59 views

What happens if the load (connected to the output of the circuit) disconnects suddenly from Arduino/ESP32?

My circuit (that contains esp32 with few current and voltage sensor) is connected to 9Ah Battery (with BMS), where the load gets connected to see the discharge rate of the battery. There are times ...
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3answers
137 views

Driving a high-impedance load from a BJT base

Are there any caveats with tapping off the base of a BJT to drive a high-impedance load, such as a logic gate or op-amp? In the schematic below, I have an open-collector output from ...

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