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Questions tagged [electrical]

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18 views

Can anyone help me with Max Swing? I'm so confused about its property

So max swing is supposed to be when ICQ=VCEQ/Rac right? I understand the fundamental part. But what is Max Swing relation to this: ICQms=min{ICQ,VCEQ/Rac}. I don't understand how it's related to max ...
0
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1answer
48 views

Capacitor question - energy from pushing a baby stroller

I’m making a circuit that will be added to a stroller. With a 24 volt DC motor, I’m trying to power the capacitor by walking around & simulating a baby/mother experience and if I run into a hill ...
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2answers
40 views

Use PNP sensor on NPN input

I want to use the IPOS3602 datasheet iPOS3602 this is a small motion controller. I have another datasheet which is protected so I can't share it. This datasheet states: The inputs are compatible with ...
0
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0answers
58 views

Make Input and Output circuit really I/O

I currently have a self designed I/O board. I'm using the LPC1768FBD100 Microcontroller NXP 3V3 and created 20 inputs and 14 outputs. My design allows only inputs to be inputs and outputs to be ...
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0answers
37 views

How to calculate slew rate given capacitance and input current [closed]

Capacitance C = 10 pF and the maximum available input current Iin = 1 mA. The voltage Vout can be written as: \$V_{out}= I_{in} \cdot R (1-e^{-t/RC})\$ find the slew rate.
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1answer
49 views

Sensor with integrated ID

I'm looking for another solution to a problem. I have 4 of the same infrared sensors which detect if an object is close or not (pretty simple). The difficult part now is that they don't have an ...
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0answers
24 views

How can I make a rasperry pi camera connector like the keyboard connection on surface pro?

I have a box which has the camera. I also have another box which contains the raspberry pi. Now when i put one box over the other, I want to connect the camera to the raspberry pi. Any questions ...
4
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1answer
579 views

Would the motor reverse if phases swapped for this case?

A servomotor power connection pins are given as follows: U V W are the three phase terminals. Would the motor reverse if I mistakenly swap phases U and V namely if I connect pin 1 to W and pin 3 to U?...
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1answer
70 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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2answers
674 views

Bulding a physical calculator from scratch [duplicate]

As you can probably tell I am relatively new to the electronics scene and I'm rather stuck on a project I'm doing for school. I am on my second year of an Electrical engineering degree, tasked to do ...
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3answers
28 views

Connecting the Block AIM 5.0/2.0 auto-transformer to UK three-wire plug

I am not electrically very knowledgeable person. At the moment I am trying to connect a Block AIM 5.0/2.5 Auto-transformer to a piece of very sensitive medical equipment. The auto-transformer was ...
1
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1answer
72 views

How do I connect an LED with floating DC voltage?

I want to connected an LED at the output of 500V DC. This DC power supply is made by 3phase DC rectifier and is floating. I would like to have a display on the front panel of the supply which will ...
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1answer
45 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. ...
0
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1answer
44 views

LED lights with a dim light in open circuit [duplicate]

I was installing new LED lamps on my kitchen, which seemed to be functioning well. After turning off the lights, the newly installed lamps still had a dim light, that kept itself for quite long. I've ...
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0answers
40 views

Find force pull solenoid

Sorry for the previous post that was wrong. I want to knowF=(NI)^2*μ0*A/2L^2 A What is the cross-sectional area? NewRef.https://www.researchgate.net/publication/...
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1answer
55 views

Bjt circuits, “Vbe = 0.7 at edge of conduction”

could you explain what "eoc" and" eos" (edge of conduction and edge of saturation) is? The problem says "Vbe = 0.7 at edge of conduction" , is that in cutoff mode?
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3answers
92 views

How is e=200sin(𝜔t+40)V equal to E=200∠40?

If we expand the first equation it goes like this: \$e = 200(\sin(\omega t)\cdot \cos(40) + \cos(\omega t)\cdot\sin(40))\$, Which means there is still \$\sin(\omega t) + \cos(\omega t)\$ remaining in ...
-4
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1answer
100 views

Earthing system on a mobile vehicle?

We have an electrical system which needs a low impedance earthing system below two ohms. We have provided a proper earthing system in our factory and it works well. Now my question is if the system is ...
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1answer
46 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 ...
0
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1answer
58 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 ...
0
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1answer
293 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: ...
0
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1answer
11 views

Two port network z parameter determination

I would like to know how it is solved in book as I found that it is way quicker than the way I solved. Any detailed explanation will be appreciated.
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1answer
30 views

The differential protection relay

The differential protection relay may lose its stability through fault due to the saturation of a CT magnetic circuit during a short circuit condition. To overcome this, which type of relay should be ...
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1answer
35 views

What is the current drawn by a faulty appliance? [closed]

Is the current drawn by a faulty appliance greater than the rated value or is zero?
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3answers
110 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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0answers
11 views

why the stator magnetomotive force lags behind stator armature current in salient pole alternator

https://circuitglobe.com/two-reaction-theory-salient-pole-synchronous-machine.html?fbclid=IwAR1ODRDONC27LIL83Lvb3WohPaSrIG4BRZ8l-ATyeloZEqrZ6juKw__jNMQ] Hello guys in two reaction theory of salient ...
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3answers
127 views

Help identify positive, negative and ground on a LCD screen PCB

Let's just say I know nothing about electronics, so please bare with me on improper terminology. I have a LCD screen that I have disassembled as I am trying to make a Touch screen mirror fit into a ...
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0answers
48 views

Arc Flash carbonized particles initiation

Ok. I'm investigating an arc flash accident. In the above image. The breakers encountered a first short which deposited carbon into the plastic enclosure and lugs. During a second event. The ...
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2answers
3k views

Why does the current not skip resistors R3 and R5 when R6 and R4 have no resistance?

I do not understand why the current still flows through resistors R3 and R5 when R6 and R4's resistance is 0. To me, it would seem that the current would skip R3 and R5, however the answer key says ...
0
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1answer
34 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 ...
0
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2answers
71 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? ...
0
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1answer
60 views

Assemble Peltier Cooler to Li-poly Rc Battery

I have procured a thermoelectric cooler (TEC, this one) and my purpose of the TEC is to produce current for the Li-poly RC battery to increase its battery life. The Li-poly RC battery has 7.4V stated ...
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0answers
24 views

permanent magnet synchronous motor Lagrangian in qd0 frame

I'm trying to derive a symplectic model for a permanent magnet synchronous motor (PMSM) in the rotating qd0 reference frame using a geometric integrator. For that purpose, I need the discrete-time ...
0
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1answer
77 views

How do I convert 1/3 to signed float 8 bit?

The formula is as follows: (-1)^[signed bit] * (1.[significant bit]) * (2^[excess bit -3]) or (-1)^[s] * (1.[f]) * (2^[x-3]) It is a question posed by my signals and systems instructor, hence the ...
1
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2answers
94 views

Permanent magnet synchronous motor (PMSM) equivalent circuit

I am trying to model a PMSM (permanent magnet synchronous motor) in LTspice and in order to do so I need to form an equivalent circuit. Through some research I believe the circuit should be formed in ...
0
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1answer
43 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 ...
2
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1answer
63 views

Trying to wire in LED to show cooker element is on/off

Hi I'm a mechanical engineer so please bear with me. I'm trying to wire in an LED to show whether a cooker element is on or off. Looking at the diagrams below, the easiest way to do this would be to ...
0
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0answers
59 views

PI or PID vs Manual Controller design using Control theory

Why should we design a controller manually using Bode plots and control theory instead of using PI or PID controllers and tune them? Or more specifically when should I design a controller and when ...
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3answers
73 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 ...
0
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1answer
47 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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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
49 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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0answers
24 views

Gauss' Law for Electric fields

Is Gauss' law valid for space varying electric field? Gauss' law: Flux = Charge enclosed/Epsilon For same field E, flux = line integral of E.ds, ds- small area element What happens when E is ...
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1answer
28 views

splitting sensor signal line

Is it possible in circuit design to split like say a temperature sensor line reading into 2 wires, and read by 2 different system/circuitry? My motive is to tap the signal line in a safe way without ...
0
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1answer
42 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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3answers
78 views

MOSFET for revrerse voltage protection

I have used the following circuit to for the purpose of reverse voltage protection. But, I am a little bit confuse about the working of the zener diode in combination of the 100k resistor in this ...
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1answer
42 views

Can ECG electrodes be used for EEG detection?

Im having financial limitation for purchasing EEG monitoring modules or electrodes. But so is not the case for ECG. I am doubtful whether I can use ECG electrodes for EEG since brainwaves are in the ...
0
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1answer
104 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 ...
0
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1answer
136 views

How to design RF PCB to ensure the 50 ohm impedance

I do not have any experience designing RF circuits and I am finding many challenges for my project. One of them is to match the 50 ohm impedance that some components demand. In the input of my PCB I ...
0
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1answer
75 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....