Questions tagged [electrical]

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14 views

Electric bicycle and an electric scooter

Assuming that an electric bicycle and an electric scooter use the same motor and battery, which has more autonomy? that is, which makes more kilometers / miles per battery charge cycle? Obviously each ...
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16 views

Generally speaking are inrunner motors better generators than outrunner motors or vice versa?

Using a motor as a generator but looking to test something I understand that outrunners have a higher torque but would that be neccesarily good for generating electricity or not?
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0answers
14 views

best refractory cement for embedded heating element furnace

first post I designed a 2000 watts 1000 degrees Celsius furnace with following chamber size: 11 cm length, 12 cm width and 15 cm depth. The refractory that I use is 1880 C high temp tabular alumina ...
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1answer
37 views

How effective are pancake motors as generators and why

Using a motor as a generator but looking to test something Why would or would they not be good generators thanks
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1answer
34 views

LPF Second Order use cascade

What is the minimum value of $R_2$ (in $R_1$) to minimize loading effect? Please explain the concept.
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2answers
37 views

Integrator OpAmp

Tell me how can the 's' in first equation described with the 'integration' in second equation?
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1answer
47 views

Operational Amplifier

In this case, can I say that $V_E$ correspond to -0.7? if yes, why can this be?
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0answers
33 views

Finding Supply/Nominal voltage for Torque Motor BLDC

I'm a bit confused by torque motors datasheets as it never mentions any nominal voltage. I would like to run a torque motor on a 24 V battery. The required max torque is 150 Nm (=21000 ...
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1answer
17 views

What is the material requirement for Van der Graff generator sphere?

I would like to make a Van der Graff generator for my science fair project out of aluminized mylar. Do you think this might be feasable or do I need to use thick stainless steel ball? Is there some ...
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1answer
36 views

Implementing logic expression and the truth table of logic function

(a)Z=(B+C')A+B(C+D')+BD Z=AB+AC'+BC+BD'+BD Z=AB+A'C+B Z=B+AC' (b) A B C|Z 0 0 0|0 0 0 1|0 0 1 0|1 0 1 1|1 1 0 0|1 1 0 1|0 1 1 0|1 1 1 1|1 (c) BC 00 01 ...
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0answers
42 views

12v relay to open and an close switch without sending power to switch

Sorry if this is elementary but here's what I need. I'm trying to power a relay via 12v DC (vehicle) to open a closed switch while the 12v power is sent to the relay. Essentially, when the blinkers ...
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3answers
42 views

corrosion in electrical parts and wiring

I work in a pharmaceutical plant where saline solution is produced and bottled. The environment has to be clean (by pharma standards), which rules out many greases and other protective coatings. As ...
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1answer
31 views

Voltage controlled switch?

So I am in the process of working on a rather strange and specific project. I am looking to capture as much energy as possible from a small steam turbine using a DC motor and then use that to power ...
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0answers
32 views

How to prototype this circuit using an Arduino and breadboard?

I'm trying to build this circuit for a force transducer such that the data is logged by an Arduino Uno. I have the op-amp recommended in the schematic, but I haven't been able to get stable readings ...
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2answers
60 views

What is the name and purpose of this Instrumentation / Mechanical fitting

The component I am interested in is the blue "head" in the attached image. I call it the sensor head but will like to know if it has a specific industry name
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1answer
38 views

Electric Motor Sizing : Understanding how much torque I need given Force

Physics has never been my strong point... I have a task to size a motor. The question is: Based on information below, how do I calculate required motor torque to accelerate a mass with the ...
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1answer
39 views

How much power will 4 germicidal lamps use?

I was wondering if this portable power supply will be sufficient for running 4 UVC lamps all at once. If so, for approximately how long? Power Supply: SUAOKI G100 27000mAh /3.7V Power Bank Station ...
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1answer
115 views

How do renewable energy sources deal with reactive loads?

If a power grid were to fully switch to renewable power generation methods how would they deal with reactive loads?
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1answer
24 views

Breath Sensor: A low range pressure sensor that won't be affected by humidity

I am designing a device that will measure the force of a breath through a tube. A small differential pressure sensor like this https://www.digikey.ca/product-detail/en/MPX10DP/MPX10DP-ND/464046 would ...
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0answers
62 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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2answers
127 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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2answers
30 views

Outdoor 12v power supply

I have a 12v 300 watt power supply. I replaced 13 20watt halogen bulbs with 13 3watt LED bulbs. Questions: should I downgrade power supply since I'm now drawing 39 watts as opposed to the 260watts ...
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2answers
121 views

why do 15kV 60mA transformers have to be so big?

I need a high voltage power supply for the homemade CO2 laser I am building. I understand that a 15kV 60mA transformer is a thing, but its very big and heavy and its out of phase meaning each lug is ...
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1answer
26 views

shaft speed when 2 motor connected [closed]

I have motor 1 1000 which rpm & motor 2 which 1500 rpm connected with shaft via gear ratio of 1:2 and what will be the shaft speed ? how can i calculate shaft speed? I am considering the shaft ...
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2answers
69 views

Is hall sensor also used in PMSM drive scheme as like used in BLDC motor?

I am little bit curious about, is hall sensor also used in PMSM motor drive? Since in PMSM motor the voltage applied is sinusoidal, all 3 phase are active, so a rotating flux is introduced, which is ...
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1answer
26 views

where to find / what to call a 3/4 inch air valve that can be opened/closed electrically? [closed]

I'm looking for something like this air valve: (as discussed in https://engineering.stackexchange.com/a/12404/12007) But I need to tube to be wider (3/4 in), the tube to be shorter (the shorter the ...
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1answer
35 views

DC motor disconnect sensor

Looking for advice on how to turn off a motor when there is an item blocking a sensor. I found an inductive proximity sensor that I think could work. I am trying to make a brass case annealer similar ...
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0answers
34 views

power calculation

In a perfect world, there should be a constant assigned to the angle difference between voltage and current , no inductance. I suppose the angle is unique to the amount of inductance in each circuit....
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1answer
7k views

What's the difference between aircon modes Auto, Sun, Snowflake?

Most air conditioners have three modes: Auto, Sun, Snowflake What is the difference it terms how it works?
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1answer
65 views

Quantifying Static Electricity Hazard with High Explosives

In the making of firework explosives, the explosive mixtures are handled with great care to avoid static electricity induced detonation of the explosives. Is it a good idea that they store the ...
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5answers
632 views

Why do electric cars claim “instant torque?”

I was at a well-known electric car company today and they claimed "instant torque." The quote was something like the following: Driving this car is very different from a gas-powered vehicle. For ...
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1answer
95 views

AC power fluctuation microwave oven

I think this is an electricity question: When I start my microwave, it starts normally the motor revs down drastically, then back up to normal, then stops. ..a total of about 10-15 seconds. ...
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1answer
49 views

Natural gas boiler Vs. Electric Heater efficiency

If a facility buys natural gas at 8 dollars/Mcf to provide heating from an 85% efficient natural gas boiler, what is the equivalent cost of electricity ($/kWh) for a 95% efficient electric heater? I'...
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0answers
25 views

New electrical engineer seeking advice on electrical design for hotel! [closed]

I am a recent graduate who is working on a brand new hotel project. I am helping to design the electrical system. I was wondering if anyone who is in the field would be willing to help me by giving me ...
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1answer
88 views

Elevator standby + moving passanger , electricity consumption changes

I'm interested specific on electricity consumption changes on 2 different situations inside an elevator. When the elevator is stopped and people enters the elevator, does it change in any way the ...
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1answer
37 views

Choosing the best type of portable cord for a consumer electronics product

Consumer-level electrical portable cords come in a variety of types (and gauge, but that's not the subject here) and each must have its rationale, considering the cost constraint (performance/price ...
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1answer
96 views

Balancing Locomotive Power

My first post here. I'm curious about how power is balanced in multiple diesel-electric locomotives. I understand to that two locos can be ganged in terms of controls, to set speed etc, so that one ...
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3answers
812 views

Does good electrical conductivity imply good thermal conductivity?

Typically materials which are good conductor of electricity are also good conductor of heat, and vice versa. Are there notable exceptions?
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1answer
47 views

Feedback on idea for a power station

Hi there, When I was very little I came up with this idea for a power station and I recently remembered it and was curious about the viability. The way it works theoretically is that a voltage supply ...
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2answers
139 views

Cost Value of Changing appliances that run on 240 down to 120

I have lived overseas for many years and purchased your standard appliances. Anyway moving back to the US, I had to purchase transformers to bring the voltage down from 240V to 120V. I know that ...
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0answers
150 views

Calculating gain of an overall system. Analogue electronics

Our professor has given us a review for a upcoming exam. But he has never done anything like this question and it has stumped a quite few of us. We are hoping someone can walk us through this so we ...
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1answer
66 views

Split phase on industrial devices

I want to build a professional CNC router for my garage. I want to use the residential split phase configuration for power to my VFD and industrial power supplies. I cannot find any straight answer ...
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1answer
576 views

Why are coils used to generate magnetic fields

I understand that coils have properties over a single wire in producing a magnetic field. But I'm a hobbyist not an expert. I know electricity was discovered from a wire carrying a charge when ...
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2answers
2k views

Electrical flowchart in Microsoft Visio : issues

I am trying to recreate in Microsoft Visio a diagram of a photovoltaic power plant that would look like the one below. But I have some issues for doing so, in particular : I don't know how to ...