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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Transformer output connected to another transformer. Measuring 'Real Power' at input of first transformer

I have a watt meter connected to the primary of one transformer to measure power. The output of this transformer is connected to the input of another transformer. The watt meter is measuring the ...
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46 views

Choosing a DC Electrical Motor for Linear Movement [migrated]

I would like some help defining the specification of my motor, as I have little experience in this field. I've tried researching through Google, but the information is insufficient or unrelated. The ...
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2answers
39 views

Using a Servo motor as load on a system

Can a Servo motor (or any electric motor) be used as a load on a system ? meaning can it reprisent for example a certain dead weight ? In the picture below you can see a motor driving 3 gears, to ...
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41 views

whats the right kind of reference to calibrate a measurement instrument?

I have been working in a calibration system for a multimeter I'm developing To do this i'm calibrating the reading values using Fluke meters (bassically my instrument has to match the fluke ones) ...
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65 views

Why would an electronic timer have a minimum load?

I need to replace an electronic timer lightswitch, and both the old one, and this example of a replacement, state that they have a minimum load of 40w. Why would the switch have a minimum load, and ...
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35 views

Transmission lines/Antennas power delivered to a load, why halved?

When seeing transmission lines and antennas in class we saw that the power delivered to a load is equal to: $$ P = \frac{1}{2}\cdot \left | I \right |^{2}\cdot Re\left \{ Z \right \} $$ Where I is ...
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49 views

3V7 to 5V level conversion

In my product i am using a wifi module requires 3.3v and a bunch of other components requires 5v. For this i am using 3.7v 3000mAh battery. So here i have a doubt whether to use which case or any ...
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17 views

Lenient MUX and Load Signal

https://www.youtube.com/watch?time_continue=25&v=d3bF2v056WU http://i.imgur.com/ipDYgd8.png I'm going to ask about some names. You could say "they are just names" but if I get some context for ...
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58 views

AC load driving using FET

I want to drive an AC 220 V load(heater) controlled PWM from Microcontroller. I want to use power FETs to load drive upto 2000 Watts. I m not guessing any valuable circuit design. If anyone have any ...
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83 views

very basic basics [closed]

I just started studying but I've been having problems because my professor assumes that we know very basic things that we actually don't. So my questions are: What do I need exactly to have an ...
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2answers
71 views

Severe Voltage Drop When Applying a Load to Opto-Isolator Circuit

The circuit below uses the Vishay ILD213T optocoupler (datasheet). The load in question is a 5V solenoid valve with a resistance of 46Ω. The circuit is configured with "IN1" connected to a GPIO pin ...
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80 views

Buck converter load testing

What is the best way to test the load response of a DC DC buck converter? I thought that a power resistor to fully load the circuit would be the best thing to do. Any thoughts on that? Specs: ...
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2answers
71 views

What is the effect of heavy loads on the electrical grid?

When our neighbors turns on a motor, a bulb in our home turns off for a very very short time and then it turns on again. It is something like a quick flash but a man eye can notice it. Would you tell ...
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1answer
48 views

What is the real purpose of analysing an amplifier with resistive or a current source load? How does its behaivor change?

We're analysing in class common source, common gate and common drain amplifiers and the analysis of resistive load and current load is being done but I don't get the purpose of doing this... how does ...
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1answer
37 views

Simple Analogy for Impedance and Load?

Can someone explain what impedance and load really are? I have a textbook in front of me and I have taken and passed the EE class on it, but aside from a textbook definition I can't seem to get a ...
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1answer
66 views

A question about very simple light Dimmer circuit?

I've learned that a Triac works as a switch for controlling AC current. Why not connecting the load (L1) and Triac in series? at the position of red arrow? My reason is that a small amount of current ...
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1answer
25 views

Powers Signs differ between sources and loads?

Alright, so my textbook specifically states that negative power indicates that power is being extracted from a device (I'm assuming they mean for loads) and then shows a negative power value at a ...
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1answer
41 views

Reversed Current in Passive Loads?

So I'm starting with the Nilsson/Riedel electronics text and got confused early on. They show a simple loop circuit (figure 2.15 for those who have it) with 1 ideal voltage source and 3 resistors and, ...
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41 views

Output capacitor buck converter

How do I calculate or design the best output capacitor for a buck converter. I know I can choose practically every value if I stick to the digital schematic, but I need a real PCB in the end and I ...
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2answers
74 views

How does one load draw more or less current compared to another load? [closed]

What got me asking is I'm currently studying about NPN transistors whose base draws very little current. Why does the base draw so little current, lets say compared to the collector? What ...
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1answer
143 views

LM317 constant current load

Would this work as a constant current load since I don't have a high power pot? Is there a better way to do it? simulate this circuit – Schematic created using CircuitLab
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93 views

Can I use a capacitive divider to run an AC/DC converter from a higher voltage than its rating?

Suppose I have an AC/DC converter rated to run from 120-240VAC, and I want to run it off 480 VAC. I think I should be able to put two capacitors in series as a voltage divider, and run the converter ...
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56 views

What sized motor could spin ~2lbs?

I am working on a prop for a film -- I have to make a sign spin in a circle (simple attachment to a motor) and have variable speed. I know enough to wire the thing, but am having a hard time getting ...
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60 views

DC Supply Load Dummy based on NPNs

I am fixing an old regulated load dummy that I use in my workspace. It was a mess and I want to modify its regulator side. My question is: will the circuit showed in the image work properly? If you ...
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1answer
169 views

Few doubts about turning an atx psu into a bench lab power supply [closed]

First, thank you for your time of reading my questions. As the title suggested, my questions are about turning a computer power supply into a lab power supply. I already did my homework and read ...
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1answer
155 views

Step Down Regulator - Output voltage unstable/voltage drop with load

I'm currently trying to build a USB charger device for my mobile phone using an old 12V car battery as power source. I purchased different step down modules (see below) to regulate the voltage from ...
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34 views

How to determine load to use in a battery discharge curve

I am making a discharge curve of a battery I am testing. So for the discharge curve, what load should I use? (This was kind of answered here, but it was kind of a guess in that the load is based on ...
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2answers
98 views

Calculating the discharge of Ultra Capacitors

Say I have two 500F ultra capacitors, connected in parallel, charged at 15V. These are the capacitors BMOD0500 P016 B01. Then say I connect the capacitors (via an inverter) to a 230V light bulb that ...
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1answer
53 views

What does “Exclusive of Load” mean?

Short Version: Does "30mA exclusive of load" mean the minimum draw while idling, or avg. draw? Long Version: While designing a circuit to interface with a radar sensor similar to this, I've noticed ...
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115 views

Draw relation of rotation speed and output power of PMAC generator with brake resistor

I would like to draw a graph showing the relationship between rotation speed and power of an ideal Sinus PMAC generator with a brake resistor R(load) to be defined controlled via a 4Q Controller ...
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1answer
64 views

Effect of load changes on buck converter

I know to some extent that the control block monitors the output and adjusts the duty cycle accordingly and the output changes with change in loading (that's why the control block is used in the first ...
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1answer
70 views

constant load on load sensor

I heard it is impossible to create scale which will have constant load on it. Is there any workaround, or what type of sensor should I buy? I need to build a scale which will handle up to 100kg. ...
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3answers
118 views

How can I properly tell if a wall wart is OK to use for old hardware?

I bought a Sega Genesis model 1 from a local thrift store recently for $10. It was sold as "broken, for parts only". It didn't come with any cables. I've ...
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1answer
50 views

Current monitor shows overload even for small load

I have a current-shunt monitor using INA202 between a 5V power supply and loads. The current monitor should turn off a MOSFET switch and disconnects the loads if the load current goes over 150mA. I ...
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80 views

Series inductor as discontinuity in transmission line

Dual to this question is the following circuit: simulate this circuit – Schematic created using CircuitLab An infinite transmission line (with characteristic impedance \$ Z_0 \$) ends ...
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1answer
107 views

Shunt capacitor as discontinuity in transmission line

As in the following circuit simulate this circuit – Schematic created using CircuitLab suppose that an infinite transmission line (with characteristic impedance \$ Z_0 \$) ends upon a ...
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1answer
1k views

What is load impedance?

Like resistance for DC, Impedance is for AC. But what is load resistance. How does it used in a circuit. Had this doubt when reading a line from the book foundations of electronics by D ...
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41 views

Load switch correctly wiring

I need to use this load switch http://www.semicon.toshiba.co.jp/info/docget.jsp?type=datasheet&lang=en&pid=TCK106G . This load switch will be controlled by an MCU. Since at startup MCU have ...
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2answers
77 views

Load Resistor for high amp low voltage testing

I want to simulate a signal of 15V / 30A through a device. I will use it to ensure that a series of prototypes are capable of switching at this current. $$ P = 15 \times 30 = 450W $$ $$ R = ...
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43 views

Two different PMOS active load structure

The following is a extract from the book Model and design of bipolar and mos current-mode logic . Here we see one implementation of active load using PMOS. And this is how active load has been ...
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1answer
40 views

Avalanche diode circuit analysis of the current load

I have no idea how to work out this past exam question. I'm kinda sure is that the diode is an Avalanche diode, but I'm not even sure how Zener diodes or this work. All I think I know is that with a ...
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2answers
151 views

How to find the power delivered to the load?

I'm trying to solve a homework problem to find the power delivered to the 10Ω load. So far I found the total resistance, which is 12Ω. And I think I have the right formula to work out the power, ...
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2answers
98 views

How to use CR2032 button cells for excitation of load cell

I am using a load cell that required 9-12V excitation voltage. Can I use a few, say 4 CR2032 button cells to generate 4x3V=12V of excitation voltage for the load cell? I could also use a 9V batter. ...
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2answers
81 views

Micro-controller as a load

For my power-supply micro-controller is a load. How does this load behave like? is it resistive or capacitive or inductive load?
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2answers
155 views

Test Battery Volts applying load

Why we need to apply a load to a battery to test its voltage? I've been testing battery capacity so far using a multimeter and just hooking the probes in the positive and negative side of the ...
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1answer
125 views

Controlling dc motor in arduino with and without a load

I wonder if there is an alternative solution to this problem: I have a 3v water pump being controlled by an arduino, which pumps water out of a bucket. I would like the pump to turn off once the ...
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2answers
498 views

How can I supplement a portable generator during peak load.

I'm contemplating purchasing a 2000W generator, to power some of my tools. One potential issue i that I have a saw that pulls 2500 W at startup and then 1800 w to run. Seems to my that as the ...
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1answer
116 views

Oscillator and output load

For the Ethernet application in my design using RMII interface, I need to drive two CMOS loads (two reference clock pins, one of a Freescale Kinetis K60 Microcontroller and one of a TI's PHY chip) ...
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1answer
80 views

estimating battery discharge current approximately from ac load current

I would like to know that if we have a data logger installed at a site and the logger measured the constant load current of 10 A from the Grid(Single phase@ 230 v) during a certain time say 10 am. ...
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2answers
313 views

Java/Arduino Controlled 120VAC Power Outlet

I'm working on a project with an end goal of controlling a power outlet with a Java program. Currently, I have the relay wired to outlets, a 3 prong 120 VAC plug, and my Arduino. Everything works as ...