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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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Are there any science fair ideas that concern designing or creating something that had a benefit? [on hold]

I am looking for science fair project ideas and am interested in any branch engineering. Would you have any ideas for a science fair project? I am in grade 10.
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0answers
31 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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0answers
28 views

Question on the RLC circuit [closed]

A mechanical system is modelled by series 𝑅𝐿𝐶 circuit. It is desired to produce an overdamped response with time constants 0.1ms and 0.5ms. If series 50𝐾Ω resistor is used, find the value of L and ...
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0answers
11 views

Which transformer would you recommend that will step down from 120Vrms/60 Hz -> ~18Vrms - 24Vrms?

I am building a power supply for one of my classes, and I was wondering which transformer you would recommend to step from 120Vrms/60 Hz -> ~18Vrms - 24Vrms Thanks all!
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0answers
12 views

how to design helical coil exchanger in electric heating furnaces?

Put one helical coil into electric heating furnace, the heating wires radiant heat to helical coil surface, the flow fluid exchange heat with coil. Could you tell me how to design the helical coil, ...
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1answer
76 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
28 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
31 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 ...
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0answers
27 views

Is it possible to lift wind turbine using paraplane to generate energy?

I wonder are there the opportunity to lift paraplane with wind turbine attached very high in the air to generate energy from wind. Remote control could be a solution to keep it up.
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1answer
32 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
23 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, ...
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1answer
638 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
59 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
49 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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0answers
9 views

How to turn off Parameter Write Enable option for Fanuc 16-w stand on Robocut Alpha EDM?

At factory we use Robocut Alpha Electrical Discharge Machine based on Fanuc 16 stand. We have "error 100. Parameter Write Enable switch is set to on." I have checked system parameters page: [9999]+[...
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1answer
24 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
44 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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0answers
24 views

Circuit Analysis 2 Q: How to find steady state response of series RLC circuit given the characteristic equation.?

Say the characteristic equation was $s^2 + 8s +10 = 20$, asked to solve for $i(t)$. Given $L=0.5H$, $R=4\Omega$, $C= 0.2F$, $i(0) =1$ and $\frac{d i}{d t}(0) = 0$. So far I've found that: circuit ...
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2answers
78 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
35 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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0answers
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Using 100 MHz em waves in microwave ovens

Household microwave oven use 2.4 GHz em waves, while industrial ones use around 900 MHz. This hints that we can use lower frequencies of em waves for cooking purpose. One major disadvanteg of ...
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1answer
55 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
113 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 ...
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0answers
31 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
27 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
45 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
33 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
43 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
50 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
30 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
22 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
44 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 ...
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1answer
32 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
37 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 ...
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1answer
50 views

Control of second order undamped system

I have the following differential equation: $$\ddot{\psi_t} + \omega^2 \psi_t = \omega R_s i_f - \omega u_f + \dot{u}_t - R_s \dot{i}_t$$ where $w$ is the electrical speed of the motor. I have ...
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8answers
431 views

How to install a wired sensor in a rotating bin without tangling the wires?

I want to insert couple of moisture, temp and humidity sensors in this bin to take readings from the compost. But how do i install it without turning/tangling the wires? Can anyone help me figure a ...
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0answers
26 views

Biot Savart law

Imagine a straight wire carrying current. Consider a very small part of the wire. Magnetic field at a point B due to this small element can be calculated using Biot savart law. Consider following ...
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0answers
36 views

Can I power 4 DC motors with an AC/DC Adapter?

I have 4 24v DC motors that I would supply with a 24V 5A AC adapter I have motor drivers (l298n board) though so I wont be connecting them directly to the adapter. Question: Is it safe if I power ...
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0answers
29 views

Difference between a positive and negative adjustable voltage regulator (LDO's)

I am having trouble understanding the difference between positive and negative adjustable voltage regulators (LDO's). There are circuit diagrams for the positive LDO's such as the following: I am ...
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0answers
24 views

Relationship efficiency and capacity

FYI I am an economist so please forgive my lack of understanding of subtleties and interpret my question in the best spirit! When different documents, e.g. by government agencies or electric ...
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0answers
18 views

Transition frequency of power transistor

Why transition frequency of power transistor is typically below 30 mhz? Detailed search on internet doesn't reveal any power transistor which can handle 5 Amp or more and has transition frequency of ...
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1answer
20 views

Propagation delay of magnetic field

Imagine a source of oscillating magnetic field, say 10 Ghz. Now change in a magnetic field propagates at the speed of light, assuming a vacuum. Consider point B to be 30 cm from the source. The ...