Questions tagged [electrical]

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17
votes
7answers
4k views

Staying in Phase On The Grid

I have been an EE for over forty years and never did find out the right answer to this one.... How do power-stations and transformer switching stations ensure that the power they are feeding into the ...
2
votes
1answer
50 views

i wonder about scott connection [phase shift] [closed]

something like wye-delta and delta-wye connection. we can originally know wye-delta connection is step-down transformer and second side voltage phase is being to -30 degree. And also delta-wye ...
2
votes
1answer
235 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
votes
2answers
500 views

Why to use 50/60 Hz Frequency and Not other Higher/Lower Values? [duplicate]

At our homes and utilities, the frequency is 50/60 Hz. Why not use any other value such as 500 Hz, 200 Hz or a small value 40 Hz, 30 Hz. Previously I searched it over the StackExchange but I want to ...
2
votes
2answers
415 views

How current is steady after pinch off voltage?

I was studying the JFET. In the books and other material it is mentioned that when the voltage between the drain and source is increased then drain current is also increased. After a certain point (...
2
votes
1answer
246 views

Why does a turbine with PMSG and full converter system draws reactive power when turbine is stopped or there is no wind?

Our turbine has a permanent magnet synchronous generator and full converter system (rectifier diods for rectification and IGBTs for chopping dc link voltage and as inverters) which means its generator ...
1
vote
0answers
45 views

Maximum power transfer theorem [duplicate]

Im very stuck on where to go with this question. The examples in class used complex numbers, where as this doesn't seem to need them. Im aware that Zs = Zl, but does Zl=Cl+Rl? Any help with how to ...
1
vote
1answer
84 views

Distance and voltage/watt loss?

I have read multiple posts on here regarding voltage/watt loss but I wanted to see how it would apply in this situation that I can not seem to solve using available resources. Maybe I just do not ...
1
vote
2answers
190 views

Why is the capacitor in this circuit not becoming an open circuit?

In this circuit you can find an RC circuit and 4A DC current source. I thought that if we use a DC voltage source instead of a DC current source, this circuit would become open circuit after a while. ...
0
votes
1answer
76 views

Impedance load matching

So I've done this so far, and know one of the components is a 50ohm resistor. However I dont know where to go from here. How do i decide if its an inductor or a capacitor? This is a past paper exam ...
0
votes
1answer
96 views

How could the Gate-Source potential difference be neglected?

I’ve been reading the book Electronic Principles by Malvino In the Voltage-Divider bias section of JFET, if gate current is negligible then how did Gate Voltage attain a negative value, given Vdd ...
0
votes
3answers
293 views

Using Thevenin's theorem, how do you find the Thevenin voltage?

The above image shows a circuit. It is required that we simplify the circuit using Thevenin's theorem to find the Thevenin voltage, current and resistance. I've done a countless number of problems ...
-1
votes
1answer
270 views

I don't quite understand how voltage and current work. Please help [closed]

So I've been reading a book about electrical engineering and I still don't understand this: In a series circuit, the current stays the same, right? But when there is a resistor, it resists the current ...