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Questions tagged [electrical-engineering]

Study and applications of electricity, electronics, and electromagnetism. Use this tag when someone who has trained as an electrical engineer is likely to be able to answer your question.

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What is the purpose of the isolated subpanel terminal of a solar inverter?

In a grid-connected (utility-interactive) battery-based PV system, what is the purpose of the 'Isolated Subpanel' terminal of the inverter? EDIT: Found this descriptive image and hence answered the ...
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1answer
44 views

Is there such thing as supreme board for international arbitrators?

My cousin is a mechanical engineer, got contacted today from someone who claimed to be working for the supreme board for international arbitrators (sbia) and ICAC in the Middle East and north Africa ...
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0answers
28 views

Where can I find an Electrical Engineering master or phd student for my GPR radar project [closed]

I want to make this project but lacking manpower and knowledge. I want to include one having knowledge and excitement. Where should I find one? I am just graduated. So no money I can offer. I can ...
1
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1answer
45 views

Tethered Balloons vs Towers for Wireless Communication

If we use tethered balloons (aerostats) with wireless gateways fitted on them (let's say for Cellular or LPWAN communication), they can provide much more coverage owing to the height they can reach (e....
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0answers
34 views

Simulating a mass - spring - damper system

I have a mass - spring - damper system with external force and I am trying to simulate it using Matlab. I want to have a linearly parameterized form and use the least squares method to find the ...
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2answers
88 views

The concept of flux

I find it difficult to understand the concept of flux and field.I have searched the internet and refered a few books.From what I understand, generally flux can be defined as "some quantity per unit of ...
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0answers
37 views

Front loading washing machines vs. the never spoken top loading horizontal-axis rotating drum washing machines?

Front loaders are often recommended and for good reasons, in Europe they are the most used type of washing machine, but I always wondered about this type of washing machines: https://en.wikipedia.org/...
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1answer
38 views

Question about converting 220V lamp to 110V

I have an old classic lamp (Tolomeo). It was purchased when we lived in Singapore, so it is designed for 220V. Since we moved to US, I have not been able to use it as the power supply here is 110V. ...
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1answer
83 views

Inverter + Direct drive vs. Belt drive motor in washing machines?

What should I choose from today. I am looking at washing machines, and I see that LG has this Inverter Direct Drive (6 motion cleaning) technology in their machines, I see that its not like a year ...
3
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1answer
64 views

What criteria to focus on when selecting a BLE module?

I am trying to select a BLE module for low power application. I have looked into different BLE modules from different chip manufacturers. For example: ISM78G1D Bluetooth Low Energy SIP from Inventek ...
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2answers
34 views

Can an AC rated temperture switch be used in a DC control circuit?

Looking to add a "high oil temp" warning on a machine tool by adding a temperature switch into the hydraulic circuit, right after the radiator before returning to tank. I know monitoring from the tank ...
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0answers
43 views

What are the strengths and limitations of the antenna design of the Montjuïc Communications Tower?

The Montjuïc antenna is an interesting design for an antenna. I presume the design is principally an antenna, but perhaps it is not? If the ring + mast is an antenna, how does the ring work to ...
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1answer
28 views

Why is it difficult to manufacture capacitors in femtoFarad or lower range?

Capacitors available in the market have a lower bound around 1 pF or 0.1 pF. Why is it difficult to manufacture capacitors in femtoFarad or lower range?
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0answers
5 views

PMDC motor torque constant

I want to find the torque constant of the PMDC motor, but the problem is i don't know the efficiency of gear which is attached in this motor system. Also no encoder is attached with this.
1
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1answer
46 views

LC oscillator circuit

Consider the following circuit: Let both capacitors be charged to equal voltage. The circuit acts as LC oscillator circuit with resonance at $f= \frac{1}{2\pi\sqrt(LC)}$, where C is the resultant ...
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0answers
29 views

High Pass Filter Design from Transfer Function

I need to design an active high pass filter circuit that implements the following transfer function: $$G(s)= 4.15\times\dfrac{s+530}{s+2200}$$ where, $K = 4.15$, Pole @ 2200 rad/s and Zero @ 530 rad/...
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0answers
40 views

load in a stepper motor

I want to move a 7 kg object linearly, using a stepper motor. How can I determine the torque required by a stepper motor depending on the load?
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1answer
93 views

How can I use a 5V pwm with a 12V pwm

I'm trying to control my 12V fan with a 5V fan controller. With this circuit the fan run at full speed. When I measure the voltage on PWM and ground I obtain 5V. Which circuit can I use to adapt the ...
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2answers
34 views

Why is the Current to Motor less than Motor Rated Current?

I have a motor for a submersible pump with a Rated Current of 8.4A as given in the motor's electrical data. However, when it is running, I record a current of 3.4-3.9A. Is there a fault I am supposed ...
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0answers
34 views

LED Lights Dimmer Electronics

I have a Wemo Smart WiFi Smart Dimmer with me that can control CFL, Incandescent and LED lights. (https://www.belkin.com/us/p/P-F7C059/). I am curious to know how one device can handle all type of ...
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0answers
7 views

Quasi Y Source DC-DC Converter

How does the Quasi Y SOurce Converter behave when the switch is ON and OFF? The paper I was referring to had the relevant images but I was not able to understand the behaviour of the diodes during ...
0
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1answer
37 views

Compensating for a magnet in a device with a magnetometer

I'm working on a device that relies on data from a magnetometer. Unfortunately, the device also needs to have a fairly powerful magnet on it. Given that the design is fairly flexible, and within ...
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1answer
24 views

How are small triacs able to “switch” or control high power AC loads

I am currently looking ways to control or siwtch a max 220v 35A load. Simple magnetic relay rated for such load would work, but i am exploring the other alternatives too. here i stumbled into triacs, ...
3
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1answer
649 views

Can current passing through a wire potentially ignite gasoline? If not, why?

I am doing some restauration on my old Vespa and since the fuel indicator doesn't work, I took the fuel gauge system out of the tank and tried to understand how it works to repair it. Apparently, 3 ...
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2answers
65 views

How can I vaporize metals?

What are some common ways that I can vaporize Metals into a vacuum chamber? How can I keep these Metals in a gaseous state?
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2answers
50 views

Is it possible to generate energy from indoor draft by opening windows on opposite sides of the building?

Wind flow always generates naturally when I opening windows on the opposite sides of the building. Is it possible to put turbine on the way and generate electricity from that? It could be optimising ...
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1answer
26 views

How long breakdown voltages must be applied for breakdown to occur?

Transistors and diodes have (reverse) breakdown volatge ratings. What is not specified in datasheets are how long such voltages must be applied for breakdown to occur. Suppose a diode has reverse ...
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3answers
45 views

Will strong electric field damage electronic components?

Electronic components like transistors, diodes etc have maximum voltage ratings which when exceeded damages the respective component. Is voltage sufficient to damage a component or there must be a ...
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0answers
23 views

Achieveing sustained LCR oscillations

Consider a series LCR circuit. Once power source is removed, the electrical energy oscillates for some time before damping out completely. I want a LCR circuit such that 1) it has high resonance ...
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2answers
95 views

What is the white colored connector circled in red in the picture of a laptop motherboard called?

This is a picture of the back of my laptop (An ASUS S550CM) with a motherboard/HDD/RAM access panel removed. The white connector connects the motherboard with the laptops back panel which in turns ...
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1answer
38 views

Electric field oven

Microwave ovens use oscillating electric field of microwaves to heat up the food. Consider following design of an oven, which runs on electric field, one may call it field oven. The oven is a ...
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0answers
39 views

Charging time of a capacitor

Consider charging a capacitor C through resistor R. The capacitor will be fully charged (almost) in 5RC seconds. But this assumes that the charging source is able to deliver the required current......
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1answer
56 views

how to avoid a clash of magnetic charge and electric charge

now I'm working on a project which involves a dc motor and high voltage. I'm developing a machine consists of a motor to rotate a platform disc and high voltage will be applied during the rotation. ...
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2answers
118 views

Is it illegal to use the hydrodynamic energy contained within the city water supply to generate electricity?

If someone were to invent a device that uses the hydrodynamic energy contained within the city water supply to generate enough electricity to reduce their monthly electric bill (however unlikely this ...
2
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0answers
43 views

Flex and Static Bend Radius of a Cable: Which one should be larger?

I am looking for a cable to be placed in a drag chain that is moved multiple times per minute. Therefore, the cable needs to have a flex lifetime of over 1M times. Since the space is also tight, the ...
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0answers
28 views

Are there formula to calculate capacitance and inductance of an antenna?

How to calculate internal impedance of an antenna? Its resistance has two components ie wire resistance and radiation resistance, both these can be calculated using formula. Are there formula to ...
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0answers
23 views

Role of antenna length

Consider a receiving dipole antennae of length $L$. If electromagnetic waves of power intensity $P$ W/m2 is incident on it, then open circuit voltage induced in the antenna is given by $$V=\frac{L}{2}...
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1answer
46 views

Sensor connectivity

Dear all, as a novice I need some help from somebody with knowledge in electrical engineering. I need to supply a sensor with power, as shown on the left side of the picture. The sensor uses a plug ...
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0answers
19 views

Electrification in highspeed train

I have some questions about overhead line and substation equipment in high speed line. My first question is about if all the overhead voltage is the same for all the intervals of speed? I mean for 250,...
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0answers
37 views

What is the connection between PID and feedforward controllers?

They are tightly connected as some concepts of feedforward is based on PID algorithms, and both of them are control systems. But when I see a phrase such as "Feed forwards augment PID control", I'm ...
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0answers
30 views

Transistor's sensitivity to static and dynamic electric field

Consider a capacitor with large plates, say 30 cm x 30cm each plate with air gap. Place a transistor inside the capacitor. Gap is large so that the transistor does not touches the plates. Now charge ...
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1answer
56 views

Increasing power output of microwave oven

Microwave oven uses magnetron to generate hugh power em waves. How the power output of a microwave can be increased? It uses a 1-2 KVAC capacitor. Will doubling the voltage of capacitor double the ...
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2answers
55 views

Damaging electronics from a distance

Consider an electronic device, say wifi dongle. it is inside a wooden box. It may be a) powered up or b) without any power supply. Is it possible to damage it to render it dysfunctional without ...
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1answer
39 views

Why ESD does not affect pacemaker?

ESD from human affects electronics. Why it does not affect the pacemaker? Is it beacuse it is much below the surface?
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0answers
64 views

Determining required torque for a chain and sprocket conveyor belt

I am working on a project for an electronics class, but need some help with one of the mechanical details. My job is to program a stepper motor to move a conveyor belt back and forth as specified. The ...
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2answers
53 views

Damage to electronics from lightning strike at a distance

Electromagnetic pulse is said to detsroy electronics. Lightning is a type of EMP. As per my understanding lightning is basically a dielectric breakdown, it can be considered as DC current. Can it or ...
0
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1answer
38 views

RF energy intensity after reflection

Intensity of RF wave at a distance from source can be calculated by using inverse square law. But imagine an RF energy travels a distance $d1$ before being perfectly reflected from a metal surface. ...
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1answer
43 views

Dumping microwave oven energy on electronic device

Microwave oven generate around 1 KW of power. If this energy is dumped on a electronic device, say wifi router, gsm phone or fm receiver etc, what will happen? Will the devices be damaged? By dumping ...
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1answer
33 views

Electric field inside human body

Electric field inside a metal is zero , when it is placed in an external electric field. What about human body? If it is placed in an external electric field, will the field inside the body be zero? I ...
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1answer
40 views

Measuring beats/bounce in a closed cubed glass

Suppose that we have a $2$ by $2$ by 2 $cm^3$ closed box, made up of glass, with thickness $0.1 cm$. Yes, it is a very small box. Let's say in that box there is a ball (also made with glass) with ...