Questions tagged [electrical]

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1
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1answer
51 views

Problem with Network Topology based on circuits

I have started reading a book lately which covers an introduction to electric circuits. Currently, I'm trying to learn the basic network topology needed to solve exercises in a more efficient manner. ...
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0answers
49 views

How does a smart bulb work? [duplicate]

There is a type of bulb in the market nowadays that detects load-shedding! I mean it keeps lighting after load-shedding. But my curiosity is if I turn off the switch of the bulb, it might have ...
1
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1answer
70 views

What is the relationship between Ground Potential Rise (GPR) and Source Voltage?

I am looking at the results for an earth grid study for a 50Hz substation. Primary Voltage (Vp) = 11,000V Secondary Voltage (Vs) = 415V Secondary Fault Current (If)= 24kA Secondary Grid Current (...
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1answer
28 views

How to know if a motorcycle battery and power generator is enough to keep an device turned on without discharging the battery?

I have an arduino project in mind but I have some questions before I can start to make it. I need to plug an arduino Uno on my motorcycle, but I dont know if it will consume too much energy and lower ...
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1answer
79 views

Power Switching using MOSFET and opamp

I'm trying to understand the Arduino design. LM358 and FDN306P is connected in between USB input and primary source input. In presence of USB and primary supply the Arduino mega board is drawing ...
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0answers
103 views

What is the definition of hull voltage?

I'm studying the subject Electrical Safety in Engineering and a special term really drew my attention. When I tried to google it, no any option was suggested but hull protection. In the presentation ...
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2answers
150 views

Network Theorems on DC and AC

Are network theorems (KVL, KCL, Thevenin, Norton, Superposition, Max Power Transfer) applicable on both DC and AC networks
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0answers
98 views

Transparent Conductive Paint

Does anyone know of a transparent conductive paint? I am creating some home made electroluminescent panels and I need something what would work with water based polyurethane. Ive had some luck with ...
1
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0answers
100 views

Aluminium foil not blocking IR signal

I am using an IR sensor (vishay tsop32 series) but I want to ensure that it only sender directly ahead so I made blinders out of pla and covered them in aluminium foil. However it seems that despite ...
1
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1answer
55 views

Creating a small range, small baseline varying resistor

I am doing a design project on making a passive varying resistor device. I have a flex sensor that increases in resistance when you bend it. It has a 10k ohm nominal resistance and increase to 110k ...
1
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1answer
41 views

2 wire to 3 wire system for ZWave

I’m looking at installing a zwave system in the UK. The relays I want use require a 3 wire system. They say most of the uk is wired via a 2 wire system This is the product http://www.vesternet.com/z-...
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2answers
200 views

how to calculate resistors' value?

I'm new to electronic circuit, I'm solving some problems in the book and come across this one, but I cannot calculate the value of Rs and Rp according to the info provided. Can someone help me with ...
1
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1answer
440 views

Calculating resistance for metal layer from LEF File

I have a .LEF File which has various metals description and their parasitics information. I am trying to calculate R. It is specified as RPERSQ = 0.278. In the File description it is written as ...
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1answer
118 views

Basic electric/wiring questions resources

I have a 12V DC motor that I want to power alongside a 40 Watt incandescent bulb (I might find an LED bulb that works aesthetically).  I need to run a single cord to power both.  Preferably with a ...
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1answer
476 views

Interface Submersible water pump with microcontroller using Contactor Relay

I am making a automatic water level controller for my home,I am new to Electrical Engineering and learning things. I am using a MCU to turn ON/OFF submersible water pumps using some float switch to ...
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0answers
3k views

Ultrasonic Sensor HC-SR04 without Arduino

I am trying to build a circuitry of obstacle detection. So, till now my research says, I need : ...
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4answers
397 views

Overheating of LM1117 SOT223, 5v-3.3v

I'm having problems with my design. I put the schematic here, maybe someone can find an error that I didn't find yet. EDITED[I forgot the schematic, sorry...] The microcontroller, dsPIC, has the ...
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3answers
134 views

name of one part in electrical cables

There is an extra plastic or wrapper piece at the end of the electrical cables. I asked one of my friends about it and he said its for insulation purposes but he does not know the technical name of it....
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2answers
152 views

Ohms law and LED driver efficiency? How can this possible be true?

I am having a meltdown with a Chinese supplier at the moment and hope dearly that someone can help. I have an LED driver that is in my mind 28.8W. The output of the driver is 48 V @ 600 mA (48 V x 0....
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1answer
301 views

Help Me simplify: C*(A+B) + ~A*B

I know the answer is AC + ~AB, but how? I have tried: B(~A+C) + AC and stop. Also, I have tried: ...
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2answers
408 views

Why to use 50/60 Hz Frequency and Not other Higher/Lower Values? [duplicate]

At our homes and utilities, the frequency is 50/60 Hz. Why not use any other value such as 500 Hz, 200 Hz or a small value 40 Hz, 30 Hz. Previously I searched it over the StackExchange but I want to ...
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2answers
117 views

Multiplication of average voltage and current?

Multiplication of \$V_{rms}\$ and \$I_{rms}\$ gives average power. What things we get if we multiply \$V_{avg}\$ and \$I_{avg}\$??
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1answer
52 views

Flash in MCCB when switched off

Recently I switched off several molded case circuit breaker (MCCB) and saw a flash at the back of the breaker for an instant. This happened to all the MCCB on-site (around 14). The MCCB are all rated ...
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4answers
84 views

Why choose a PMOS over an NMOS or vice versa?

I know it sounds dum and that I sound dum but theres such a large amount of MOSFETs out there, there are N-channel and P channel devices that have extremely similar functionalities, capabilities, ...
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2answers
109 views

Is there a way to trade off amperage for voltage? [closed]

I was planning on buying a motorcycle battery or some other large battery to charge my laptop, but most of the batteries I found are 12v or lower, and I need around 20v to charge my laptop. Is there a ...
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3answers
117 views

What are these connectors called (home applicances)?

I see these connectors inside a microwave oven and other home appliances. They are installed on the ends of wires and have round edges, while the middle section is flat. What are they called and do ...
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1answer
201 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
0
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1answer
77 views

looking for a device or tester to know if car is electrified [closed]

I'm new here and definitely not an electrical expert - so please forgive any lack of clarity and errors in my terminology or tags. We live in a rural area and drive a plug-in hybrid electric vehicle ...
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4answers
80 views

Non-mechanical load suggestions for a 12VDC / 6A PSU?

I need to provide a load for the 12VDC/6A power supply. I used a small motor before, but something less mechanical (more reliable) like a light or (anything that's not mechanical) would be ideal.
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1answer
39 views

whats voltage drop on 40 yards of ws2815 leds

We are working on a project of using ws2815 led strips and our concern is how to handle the voltage drop?
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2answers
104 views

Is this an active or a passive circuit?

Is this an active or a passive circuit?
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1answer
65 views

Can not recognise this piece of equipment. It is attached to the mains

It is normally quite noisy, but has gone silent.
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1answer
68 views

Styrofoam cooler/chest ok for electronics project?

I'm building a DIY power supply using 6 server power supplies. I've been looking for a case/enclosure to hold them and the necessary wiring and came across a styrofoam cooler that's the perfect size ...
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3answers
196 views

Using Thevenin's theorem, how do you find the Thevenin voltage?

The above image shows a circuit. It is required that we simplify the circuit using Thevenin's theorem to find the Thevenin voltage, current and resistance. I've done a countless number of problems ...
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2answers
370 views

What glue used here?

What glue is it? Is it safe for attaching?
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2answers
178 views

Where to have PCB with microcontoller designed? [closed]

I’m involved in CNC milling/manufacturing/prototyping, a product we are designing needs an electrical interface that controls timing and dwell on 2 solenoids. This is something well outside of our ...
0
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1answer
65 views

Identification of Electrical Component

I'd appreciate some help identifying the component in the pictures below. The actual PCB is part of a shift interlock solenoid from an Audi A6 that went bad. I'm trying to salvage the part as it is ...
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2answers
3k views

AC RMS and DC average voltage

Imagine we're trying to get 120V output. For AC, we must have a source with a peak voltage of 169.7V to achieve an RMS voltage of 120Vac. (169.7V * 0.707). For pulsating DC, whether rectified by a ...
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2answers
440 views

Average Power Equation

The equation below states the following: P = G * v^2(t) W = Integral (P) over all time Paverage = W/(time period) Can someone explain the time period (1/2t)? Why is it not 1/T (T = period of ...
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2answers
952 views

Assigning Current Direction in a Circuit + Resistors

I'm a computer science student and am taking a basic electrical circuits course. I'm facing many difficulties, but the one that I want to address here regarding nodal analysis and determining whether ...
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4answers
69 views

How does energy dissipates in a purely reactive circuit?

Suppose in a home, power factor drops to zero. It means that the circuit becomes purely inductive. If the energy meter is connected at incoming power supply point,will the energy meter still keep on ...
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1answer
34 views

How to prevent circuit from shutting down when motor drain too much power

I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
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2answers
46 views

Voltage gradient in voltage difference across a resistor

If I have a voltage difference V from terminal 1 to terminal 2 of a resistor. I take an arbitrary point P along the resistor, between terminal 1 and terminal 2, and take terminal 1 as a voltage ...
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2answers
38 views

Echo in voice to the caller while receiver with headphone hving wire replace [closed]

Hi I just replaced the old wire in my headphone with new one.But while using headphone the caller hears the voices with his own echo but while me having headphone on has no issue of echo can speaks ...
0
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1answer
51 views

How to Measure differential conductance dI/dV experimentally?

Numerical derivation of IV curve is always a possibility to deduce dI/dV graph. How to measure it directly in voltage bias mode? What concept is required for it? What instrument are required to ...
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3answers
95 views

Wind turbine charger controller

I need help on my design which includes a wind turbine, charge controller, battery and load. The question is, what will happen to the load if the wind turbine is charging the battery and while it is ...
0
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1answer
41 views

SPI pins logic level issue [closed]

I have ESP32 and the popular dot matrix module MAX7219 8*8 module to interface. It is connected through SPI pins. After a sample word printing on the maxtix it shows garbage outputs. Is it happening ...
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2answers
62 views

Why we see a spark when we connect a plug into an already switched “ON” socket?

Why we see a spark when we connect a plug into an already switched "ON" socket? But I've also noticed that this isn't the case always, ie. sometimes when connecting a plug into a socket which is ...
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3answers
64 views

220V/1ph/60Hz equipment to operate on 208V/3ph/60Hz

Can an equipment built for 220V/1ph/60 Hz be connected to a 208V/3 ph/60Hz grid by using only two lines of the 110V each across the load?
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5answers
155 views

Voltage signal and Current Signal

Please give an intuitive explanation of difference between how a signal or data is carried using voltage and current? I'm wondering even though current and voltage inevitability co-exist, why do we ...