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Questions tagged [power]

Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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47 views

What is the purpose of a schottky/zener couple on an isolated flyback topology?

This isolated flyback topology has been generated by TI's webench. It's a classic schematics with a feedback going through an optoisolator. There are, however, two diodes connecting the switching ...
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0answers
11 views

Matrix-Vector equation for active and reactive power in a transmission line

Suppose that we know vtilde (the complex voltage phasor vector at all buses), C the incidence matrix for a network, ...
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0answers
36 views

What is frequency splitting and how to derive it's equation

I am new to electronics and want to know what is resonance frequency splitting and how to derive the formulas to find those splitting. I am a HS student looking into wireless energy transfer and came ...
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1answer
55 views

Cordless dremel hard wire [closed]

4.8 v cordless dremel. I've got a bunch of different supplies laying around all different volts none exactly right what would be most comparable battery = 4.8v-.7Ah. Supplies I have close maybe ...
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1answer
75 views

I am trying to understand this reading

So I bought a transformer VC 18/1/16 and when I plugged 240V to from the mains to the primary winding. I then plugged into my voltmeter and it is suppose to show 18V . Does this seem correct on my ...
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0answers
21 views

Power Flow Analysis

So I have this network in the figure below (100 MVA base) that I need to model with DC power flow line reactances and etc. Im attempting to set up the estimation matrix and have the following, but ...
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0answers
49 views

20 kV 100 mA Voltage Current Sensor

like the title says, i need to measure 20 kV 100 mA line. For the voltage part i found this:http://www.koncar-mjt.hr/en/docs/koncarmjtEN/documents/61/1_0/Original.pdf and this:https://www.hivolt.de/...
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1answer
38 views

TO-247 High Voltage pin clearance

I am using IXYH16N170CV1 IGBT's mounted at the edge of a PCB. The legs will be long and bent back to reach the heatsink shown in the image. This device is rated for 1700 V and 16 A. My nominal ...
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3answers
106 views

Why is a laptop power supply output voltage different from its battery?

I hope you will not mind answering. This question has long been on my mind. Normally, the adapter output voltage is higher than that of the battery. In my laptop's case, the output voltage of the ...
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1answer
44 views

How much power can transit through a power line linking generation and load?

First things first I am not an electrical engineer at all so please bear that in mind when you reply/comment. I am looking at the following problem, I have a power line which connects a windfarm to a ...
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1answer
47 views

Connecting transformer with single input and secondary two outputs

So I bought a transformer VC16/1/18 and it has two outputs. I want to get the full output on a single output. Does this look correct? The updated one Corrected not Final
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3answers
113 views

Is high current in a speaker the same as high voltage?

I'd like to build my own Amplifier, and because I know that the current creates the magnetic field, I don't understand, how amplifying the voltage makes it louder. I mean with high voltage doesn't ...
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1answer
51 views

MCP73871 Battery Under Voltage Protection

I want to use MCP73871. Is there a battery under voltage protection in this charger IC? or may I use a battery protection IC? Answer for @Bimpelrekkie I decide to use my power architecture as ...
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1answer
39 views

NPN Transistor 2N2222 fixed bias MULTISIM

I have been working on my school projects and I wanted to ask you if there is any way of editing BETA for transistor. When I click on transistor, Edit Model is not working. Anyone help me, please.. I ...
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3answers
67 views

heat dissipation in watts of equipment in a box

Here is the situation, some electrical equipment will be in low ambient temperatures and I need to make it warmer so that there is no damage to it. I want to calculate how much power in watts is ...
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1answer
60 views

Detecting mains power change: One signal when on, another signal when off

I'm trying to connect a timer output wirelessly to another circuit. These are on two separate power lines (different phases, circuit, long distance), so I thought of connecting them wirelessly, I'll ...
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3answers
43 views

How is a transistor power calculated

I refer to a 2N3055 power transistor, the spec. sheet gives the following: Max. current 15A, Max. Voltage 50V, Power rating is 115 Watts. What is the power rating calculated on? If it is E*I ...
2
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1answer
124 views

Generator Dropping characteristics

I was studying about Droop characteristics. I came across the following flow path for a thermal plant Plant is working at 130MW and 50Hz Due to some load increase, frequency of the grid drops say 49....
2
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3answers
70 views

Why is power factor such a meaningful quantity?

In my current electrical engineering course the concept of power factor has been a large topic, defined as the ratio of real power to apparent power. It is a measure of resistive power consumption in ...
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0answers
51 views

Implementing with only NOR gates [duplicate]

I have an equation y = ab + cb' How would I implement this with only NOR Gates? Thanks
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4answers
114 views

Active Energy, Reactive Energy or just Energy?

I understand the concepts of active power, reactive power and apparent power. I am not sure I am getting the complete concept about the respective energies. I am using an energy monitor to record ...
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1answer
53 views

What determines the phase difference between two voltages at an AC bus?

At an AC bus, the power flow is given by the following equation : In normal operation, the voltages (V1, V2), as well as the inductive resistance (x), are constants. So the parameter δ defines the ...
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0answers
33 views

Modelling Power Source in LT spice

I am working to model a simplified power system on LT spice, normally it is going to be voltage source with series resistance and series inductance, I was able to model the source with series ...
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1answer
45 views

How does a circuit regulate current in response to a lower voltage?

Brief background, I studied physics in college and am learning EE on-the-job through Art of Electronics and this wonderful website. So this is a follow up to a previous question I submitted here ...
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0answers
45 views

Advice for PCB layout 230V AC to 18V DC with another function (beginner continued)

I am continuing a thread Beginner's second PCB circuit design: AC to DC Does this PCB design look better than the previous and do you understand it? I also want to know if the terminal blocks ...
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4answers
141 views

How to connect multiple 0402 leds to an Arduino for a 1:87 model

I want to replicate lighting a 1:87 scale police car with the aid of an Arduino Pro Micro ATmega32U4 powered by a 90mAh 3.7V LiPo which is connected to a TP4056 5V Lipo battery charger which is ...
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1answer
53 views

What to consider when powering multiple devices in parallel?

Briefly about my background, which might inform the question. I'm currently self-educating myself on some electrical engineering on-the-job. I'm learning from Art of Electronics and some other ...
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5answers
3k views

Beginner's second PCB circuit design: AC to DC

I am designing an AC to DC converter and I just want to make sure that I am so far doing the right thing — placement of components and wiring etc. — as I am a beginner. Does this look ...
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1answer
35 views

Transformer fuse for primary coil. 240V with 16VA

So I know it may be a basic question but hear me out. These are the specs for the transformer I would like to buy. To add a fuse to the primary coil I would do 16VA/240V which gives 0.06A. Does that ...
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3answers
1k views

Can I use a 28 VDC 10 A relay to toggle a 10 kV DC 0.03 A source?

Neon signs use transformers that can output at 10 kV DC at 30 mA = 300 W. I want to toggle this power with a common 5 V relay, but the DC rating for these are about 28 V DC at 10 A = 280 W. Does the ...
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1answer
44 views

Transformer powering an alarm system heating up

I have an alarm board from Paradox, model SP6000. I power it with 16Vac/2.2A from a 40VA transformer which is connected to the electrical circuit from my house(230V 50Hz). The board has an AUX power ...
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1answer
51 views

How to find current through series of potentiometers, and if it is safe for potentiometers? (Arduino)

I have 9 potentiometer with the specs: 10k Ohms and 0.5W I'm using an Arduino Mega, and using it's 5V port output to power these potentiometers in series, and I saw online that the max current this ...
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1answer
41 views

What would cause a voltage rail to be held low without measuring a short circuit?

I have a circuit that provides power (1.8VD) to an FPGA and some ADCs. I have seen in the past where damage (ESD, EOS, etc) occurs to one of the ADCs. This causes a short from 1.8VD to GND internal to ...
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2answers
144 views

Power Supply Design Help- failure at higher currents

I am trying to design a 60V 6A supply to power a power amplifier. Here is the circuit I have so far. Feel free to open it in Circuit Lab and play around: simulate this circuit – Schematic ...
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1answer
56 views

Random Noise Voltage

I have a signal I am interested in obtaining power from. The best way to describe the signal is that it is random. In the graph, the voltage fluctuates from negative to positive with an RMS of 0.5 ...
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2answers
86 views

Finding the average power dissipated in a resistor

Well, I've a series RL circuit that is powered by a voltage source. The input voltage is given by: $$\text{V}_{\text{in}}\left(t\right)=50+\frac{400}{\pi}\cdot\sum_{\text{n}=1}^\infty\frac{\sin\left(...
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0answers
28 views

Actual direction of phasor current - Power Calculation

I am trying to calculate the complex power in this circuit. I used nodal analysis to find Vc, and the voltage at the top of the 2H inductor (=3.13<177.8 V_RMS). I did the math for all elements in ...
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2answers
38 views

How does the power efficiency of an appliance compare using 12V DC or 240V AC with an inverter?

With an off-grid system, if an appliance supports powering via both 12V DC and 240V AC, is there any difference with the power efficiency of either method excluding the draw of an inverter used to ...
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1answer
69 views

Powering a radiator fan with 12V DC power supply

I want to run an old VW Fox's radiator fan on a 12V DC power supply. I have managed to burn out two of the PSUs so far. They work for a while but after a while they start overheating and die. I am ...
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2answers
104 views

Power output of ignition coil - 2.0 [duplicate]

There was an older question about "Power output of ignition coil". The system would not let me comment on that question. So, I'll ask here. In regards to a ignition coil (non specific). OK,you have ...
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1answer
66 views

Average Power for “Infinite period of time” of a periodic signal

Last night in class we talked about the average power for any periodic function. I'm just confused of why the one halves are in the bounds for this equation. Since we are letting tau approach ...
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2answers
127 views

Is there any way to noninvasively/invasively measure the current/voltage (Power) to get actual power consumed by load?

One of the application im working on needs three phase power measurement to be done through micro-controller. The power measurement is in the range of 90kVA. Is there any way to noninvasively/...
0
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1answer
53 views

Transistor Inverter - when does excessive small wattage become a problem?

I'm trying to choose the best values of resistors given the stock I have so that I can deliver sufficient power and current to an HM-TRP radio module. In this circuit, I used the 100K resistor ...
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1answer
135 views

Trying to increase amperage of Arduino Uno digital pin (20mA) to control a cabinet lock that is rated at 12v / 2A

I am trying to use my Arduino Uno to send power from one of its digital pins to a cabinet lock, the cabinet lock is "fail-secure," so you send power to it to unlock ...
0
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1answer
50 views

Explanation of a sample circuit for the FL5160 Dimmer controller

While looking for dimmer circuits, I stumbled upon the FL5160 Dimmer controller and it's specification at https://www.onsemi.com/pub/Collateral/FL5150-D.pdf The example schematic (for example, the ...
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2answers
48 views

Best way to power a circuit from an unknown number of battery cells?

I'm designing a circuit to monitor the performance of lithium polymer battery cells and am stuck on the best way to power it. The battery packs could have between 2 and 8 cells and are supplied pre-...
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0answers
42 views

3 Phase vs line to line [duplicate]

Say I have the following three phase wye configuration: Source Let’s also assume that all three loads have the same constant resistance, therefore in this case the system is balanced and the neutral ...
0
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1answer
91 views

Determine the power dissipated in W in the 5 Ω resistor [closed]

simulate this circuit – Schematic created using CircuitLab Excuse me for my really bad use of the schematic feature I just didn't know how to switch to the phasor domain. Anyway, I'm asked to ...
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3answers
93 views

Identification of 2-tab power connector

Can anyone identify the correct plug for this socket? Those are 6.3mm tabs, for mains voltage and around a 10A load. Many thanks!
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3answers
83 views

Does voltage and current have an inverse relationship in DC power transmission?

Let's suppose that we want to transmit a 1kW via DC generator with the below voltage level. From this we can see that the relationship between the DC voltage and current is inversely proportional, P ...