Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [electric]

126 questions
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What does an EV "wall socket charging cable" do?

Known as "Mode 2 charging", this method of charging electric vehicles describes the use of a common household wall socket and common mains voltage (230 v) to charge the vehicle. This is usually done at 10 Amps (2,3 kW) while 16 Amp (3,6 kW) charging…
hadrox
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Why does magnet wire need to be insulated?

What is it about having multiple coils that enables the magnetic field? Why can't I just have one big wire or threaded wire on a motor? Sorry, it's kind of a baby question but I couldn't find the answer.
Isaac
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8
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How can two identical charges affect a point when their fields lines never even touch?

If two identical charges were to be put beside each other, their field lines will not cross but rather go to infinity. In this case, if you put a point on any part of the two fields the other field can never affect it because its field line can…
An aspiring Scientist
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6
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Efficient 60v to 12v DC-DC

I'm on the process of building a new version of my ebike electronic systems and I'm searching for a way to lower the voltage of the battery (13s = 54,6v fully charged) to 12v/5v for the accessories and various electronics. I would like to keep my…
Valentin Bonnet
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5
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4 answers

Transformer 220/380/440 V 24 V explanation

I have a circuit that uses three-phase electric power (without neutral). There is an old transformer in this circuit (see image). It converts 220-440 V to 24 V. The input has the handwritten numbers "0", "220", "240", "380", "415", and "440" on it.…
Dimitris
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What Reference-Potential does an Operational Amplifier use as "Ground"-Potential?

Wikipedia states on operational amplifiers, that, simply speaking, they provide an output voltage at their output which is the difference of the two input voltages, multiplied by some (very very large) number. Since voltages are just electric…
Quantumwhisp
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What type of active cell balancing is used in EV's?

I know that active balancing is preferred over its passive counterpart but what active balancing techniques are used in electric vehicles BMS? I also know that switched capacitor and resonant switched capacitor topologies are expensive but passive…
Shamurov
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How do the non-circuit old Christmas lights flash?

I have a 80's Christmas incandescent light string without any kind of electronics. They are static until you replace one normal bulb with one marked bulb. It seems to be that the marked bulb (that actually also works) has some kind of special…
Leandro Bardelli
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What causes the electric field to change over series resistors?

So for example if we have a a wider and a narrower wire of the same length in series, since v1A1=v2A2, in the narrower wire the charges will move with a greater velocity. Since v is proportional to the electric field, this means that the electric…
Kakukk777
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How can electrons in a tungsten filament release infrared light photons?

I have a question regarding electric circuits, specifically when it comes to converting electromagnetic energy into light in a light bulb (tungsten)filament. How can an electron in a tungsten atom of the filament release infrared light photons once…
user211797
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What happens when we increase load on a motor?

For engines when we increase the load on them while maintaining the rpm they start consuming more fuel. But what happens for an electric motor when we increase the load on it. Suppose 3 cases then: What happens when a motor is running unloaded and…
Tushar Dubey
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3
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I don't understand clearly why the ideal sources that the value doesn't match can't be connected

I'm studying recently Electric Circuits (9th edition) by Nilsson. In Chapter 2, an example bothers me. simulate this circuit – Schematic created using CircuitLab I don't understand why these above figures can't be permissible. (I know KVL and KCL,…
Junu
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What could be this particular thermometer used for?

I came across this rather strange looking thermometer. It seems to have two scales and some kind of wires inside it. There are two terminals at the top. Is it a thermostat? But it seems to be too long for one. Should be at least an arm length. It…
The_Vintage_Collector
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New capacitor in old Husqvarna 215 sewing machine

I just put in a new capacitor in my old Husqvarna 215 sewing machine. The old one burned while I was sewing costumes for my kids. I have soldered the capacitor, and the soldering seems OK, but the machine turns when I plug it in. That means I cannot…
Martin Poulsen
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Working of the Peak Torque in a BLDC

We have a BLDC motor of the following specifications , and I wanted to ask that :- If the Peak Torque lasts for about 10 seconds once activated, then after what time interval can it be activated again?
THE EV GUY
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