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Questions tagged [electrical]

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1answer
105 views

Compensated vs uncompensated Op Amps [closed]

What are the advantages/disadvantages of compensated and uncompensated op amps? Thank you in advance.
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1answer
88 views

How to know how much current is generated?

My input voltage is 4.5V. Based on this datasheet here, where do I reference in the datasheet to obtain the respective desired output current? Some background info: This is the schematic diagram of ...
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1answer
58 views

Burn In component testing

For pre and post electrical testing of burn in components under test: what is the best way to measure current and voltage through said burn in components before and after burn in to verify if the ...
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1answer
64 views

Does the depth that you plug in an appliance have an effect?

Let us assume that we have an outlet that is a bit into the wall(receptacle is set behind cover, so difficult to plug in larger plugs). If an appliance - lets us say a phone charger - were plugged in ...
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2answers
202 views

High voltage drop when load is connected [closed]

I'm getting 6 volts open circuit voltage. Whenever I connect a load (resistors), there is a huge drop in voltage values. Does it signify power input is less or is there any other reason for the same? ...
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1answer
50 views

Finding resistance and how many appliances can be connected

A household electricity system can be modelled as a fuse in series with appliances, all of which are in parallel across the 240V mains supply. In one household there is a 16A fuse in series with the ...
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1answer
90 views

Power issue on connecting controller to FTDI programmer

Hi, I have connected my controller (ATMEGA2560) input to 5V power supply. At the VCC terminal 5V is shown. The VCC, TX,RX, RESET and GND pins are connected to a FTDI programmer port as shown in figure....
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1answer
119 views

what is the German/Austrian nomenclature(Voltage and current direction) in electronic circuit?

AS I came from a country where we use the french system in defining the voltage current arrows in electronic circuit, I am confused about the German/Austrian system where I see the voltage arrow is ...
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1answer
75 views

Can you convert two wire 220 (no neutral) to normal 110?

We have a water pump way out in the field (500+ long wire run) that is wired for 220 with two wires - no neutral. It would be very, very convenient to have a power outlet at this site for tools, etc. ...
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3answers
167 views

How to supply electrical current to a motor-powered rotating shaft?

I want to supply electrical current to a motor-powered rotating shaft. The current supplied is of the order of 400-600 amperes (AC or DC). In what ways can it be done? Shaft speed is around 1400 RPM. ...
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1answer
139 views

How to calculate power used by my microphone?

I want to plug a microphone into my camcorder. The battery from the camcorder will provide the power to both the camcorder and microphone. The specifications for the battery are as follow: capacity = ...
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2answers
89 views

Current flow from a charged capacitor [closed]

How does the electric field inside a charged capacitor force the electrons in a conductor to flow and establish electricity?
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2answers
199 views

Balanced star 3ph system

I have balanced star three phase generator 380V with junction point is connected to ground And current through from junction point to ground is I0=0 for that clearly say it is balanced system when i ...
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2answers
203 views

Inverter Surge Capacity -Technique Behind it

An inverter's surge capacity indicates how it handles short-term overload before "tripping". Surge capacity is essential to start up some large loads, especially motors that need 2-3 times their ...
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1answer
51 views

LCD goes off for a moment [closed]

I have usually noticed that when ceiling fan of room is turned on, the screen of monitor or LCD goes black for a moment. Why is it? and It resumes from the same point i.e only monitor goes off and ...
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2answers
83 views

Current drain into wall at home

I checked the wall near a plug with a Non Contact Voltage tester, and it showed electricity is present in a 3 meter diameter from the plug, on the wall. I think the wire inside has some contact with ...
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3answers
140 views

Rc filter transfer function

How do you know if a transfer function for a RC filter is correct? For example how would you tell whether or not this is a correct transfer function: \$\frac{\frac{R_1}{R_1R_2}}{1+j\omega R_1C}\$ Or ...
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1answer
43 views

Connecting a 3mm electrical wire in a non air environment?

Is it safe to connect a 3mm electrical wire (running 240 V) in a complete closed no air environment (Completely sealed "Hazard proof" cabinet) ? I will use similar to the below
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2answers
487 views

ESD flooring in electrical room

Got one for you guys. Is there any reason why I should argue against putting ESD flooring inside an electrical room with 480/277V and 208/120V panels present? I would gladly accept any NEC ...
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2answers
157 views

Petroleum engineer want Electrical engineer help? [closed]

I need your help since I'm not electrical engineer :( . I'm petroleum engineer and I'm building a system to do an experiment. The system consist of five cell (40 ml) and inside each cell a ball. ...
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2answers
71 views

AC Current confusion

when an AC generator generates current it alternates, so does both terminals of ac generators has current means both are live wires ?
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2answers
211 views

What exactly is a SIM card?

Does a SIM card consist of only Flash memory or is there a microprocessor inside as well?
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1answer
28 views

Noise in transmission system

Does external noise (not electrical noise) affect system voltage? If so how does a source of sound energy distort a voltage waveform?
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1answer
26 views

Does magnetic flux depend on the orientation of the ferromagnetic rotor?

I have attached a picture of a reluctance motor setup. When I turn on the AC source, magnetic flux lines will build up. My question is, will the magnetic flux will be a function of the angle turned ...
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1answer
83 views

3 phase heater to Single phase

I have this big immersion heater which my friend gave this to me. He said that this is originally design to be a 230V 9kW 3ph immersion heater (star). I am planning to convert this to single phase. ...
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1answer
48 views

Are these valid transformations, Please guide

Please help check if the transformations in the pink are allowed, when solving a circuit. For the given circuit the goal is to find the current I1 which could be found using nodal without taking care ...
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1answer
51 views

Earth Leakage current understanding

In our design used TRIAC to control the load, As per the product field test setup i should short the neutral and earth connect together also the digital GND is connected with chassis. The input AC ...
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1answer
39 views

Flyback Converter Transformer Leakage Inductance

We are in the process of designing an inverter , in which designing a step up flyback converter is crucial. The problem, we initially faced was there were more step down transformers available than ...
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3answers
79 views

What happens when we connect battery to a circuit?

Example setup: I have a piece if metal and I have 12v battery. When battery is connected to the metal current flows through the metal. So, my question is, does electrons from battery move through ...
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1answer
73 views

Isolation transformer Confusion

I’m hoping someone can clear up some confusion.I understand how an earth reference transformer works and how if there was an earth fault there would be a large rush of current through ground and back ...
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2answers
36 views

Contact on substrate of a MOSFET

Why do we want to have an ohmic contact on a substrate terminal of mosfet? What would happen if we used schottky contact instead?
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1answer
26 views

Choosing the appropriate power plug for a given fan motor

In a fan motor I have, the written specifications are as follow : "dual power: 110/230v 50/60Hz 22/20w". I would like to power the motor directly, without electronic parts between any 220V wall ...
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2answers
49 views

shorting method of current source and voltage source

I'm learning electronic circuit and sometimes we need to short just the current sources and sometimes we want to short source voltage. my question is: why if I want to short the current source then we ...
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2answers
152 views

Should startup torque be higher in value than full load torque in an induction motor?

I found out values of my 3 phase delta connected induction motor for full load torque, maximum torque and startup torque. My maximum torque was higher than my full load torque, but the thing I'm ...
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2answers
73 views

How to apply supermesh to this?

Since there is a current in the circuit, supermesh is much preferred. However, how do I do that as the current source is not in between 2 loops? Do I just open circuit at the current source and I will ...
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1answer
37 views

Soldering back the disconnected wires from the charger board [closed]

The attached link images are the front and back photo of the board inside my charger. This charger is used to charger my son's toy car. Unfortunately, the wire soldered on this chip got disconnected. ...
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1answer
74 views

Impedance load matching

So I've done this so far, and know one of the components is a 50ohm resistor. However I dont know where to go from here. How do i decide if its an inductor or a capacitor? This is a past paper exam ...
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1answer
39 views

Corona and conductor

We are decreasing corona by increasing conductor size and making it hollow but according to definition corona depends on level of voltage so eventhough you make it hollow and increase conductor size ...
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1answer
47 views

Basic questions on biasing

I have some trouble understanding a basic concept. Here is my question. This is from a document which can be found on the website, http://www.ti.com/lit/ug/tidu765/tidu765.pdf The text ...
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3answers
150 views

Alternative to alternating relay? or help?

I'm using a littelfuse relay shown in the link to switch motor directions. I'm sending a pulse to the relay switch of 0.02s in order to switch between the L1 and L2 contacts. The pulse seems to be too ...
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1answer
60 views

motor slip vs rotational speed

In Induction motor theory the term slip is used as normalized relative speed of the rotor to the synchronous speed and it depends on the physical rotational speed of the rotor. Is there any special ...
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1answer
290 views

Embedded System power requirement calculation

How can I measure total power requirement of an embedded system which consists of a lpc2138 interfaced with various other components such as lcd, humidity sensors and temperature sensors. Also the ...
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1answer
17 views

Need to find a compatible ac adapter

I have a Syemour Duncan guitar effects pedal that I bought several years back. I seem to have lost the power adapter for it and they don't make them anymore. I looked at the power input on the pedal ...
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1answer
54 views

Can the TFT in LCD displays be made in the nanometer range?

Can the TFT elements and hence the pixels in an LCD display be made in the nanometer range? Say 10nm x 10nm?
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1answer
66 views

Difference B/w LTxxx Ics and Lmvxx Ics

I have been strolling towards being a circuit designer, using eagle and ltspice and i am trying to learn about new ic's and stuff. recently the thought about how does an LTXXX module and LVXXX(or LMXX)...
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1answer
412 views

USB Bus Powered with LDO device example

I'm planning to use the FT232R in my USB device. The device consists of the FT232R and a dsPIC33EP64MC202 (Basically speaking, the FT232 and a microcontroller only). On the FT232R's datasheet, at the ...
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1answer
107 views

High temperature of components to joining & soldering

Please help me to know the best components for the process of welding an electronic circuit to operate it in a very high temperature environment up to more than 600 degrees Celsius? Note: I do not ...
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3answers
105 views

How to calculate the voltage used to light up the emergency light from the given details of manual..?

I have an emergency light device which is given by a small manual back side of it with some electrical specification. They are: Voltage: AC90-240V 50-60Hz Current: 0.1A Power: 18W Can I ...
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1answer
109 views

How to increase veroboard's current capacity?

I want to solder below circuit into a veroboard. As I notice my motor will draw high current. Can I paste copper tape to handle the high current? What others modifications should I do to make ...
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1answer
106 views

Two isolated circuits (different ground) detecting contact with each other

EDITED: Two arduinos, each one powered by a battery. Each arduino is connected to a piece of metal. When pieces of metal from both arduinos touch each other, the arduinos have to realise the event. ...