All Questions
Tagged with electrical-engineering circuits
70
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Unable to calculate Thevenin resistance
I have to solve for the Thevenin Resistance for the following question and I am unable to do so. Any help is much appreciated.
When calculating the Thevenin resistance, I shorted the voltage source. ...
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vote
0
answers
17
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Failed in upload firmware to esp32
I'm having an issue when uploading code to my ESP32. Previously, I had configured the partition scheme to 'minimal,' and I was able to upload code without any problems. However, after I fixed my ...
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votes
1
answer
47
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Converting RMS to Maximum Power
If I have a sinusoidal voltage signal of amplitude $V_m$ driving a resistance $R$, what is the relationship between the RMS power $P_{rms}$ and the maximum power $P_{max}$ delivered to the resistance?
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55
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Strange problem with Impedance?
I've encountered a strange problem with a 12V key-fob device. We use a device to remote control a relay via a key-fob transmitter. It's installed in a plastic box that is mounted at an operator ...
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1
answer
70
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What causes a correctly sized circuit breaker to trip?
I have a suicide shower head and even though the breaker is correctly sized it trips after about 6-8 minutes of showering.
-1
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1
answer
129
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Solving a common emitter amplifier problem
My work is posted along with the question. I received help in office hours and this small signal equivalent was derived. I was told to use the formulas in the pictures to derive the voltage gain and ...
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36
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Peculiar step-down transformer behavior
I have wired several loaded transformers and when calculating power on H vs X side by multiplying current times voltage the wattage is not even close to equal with the H side having 2 to 3 times more ...
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-1
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1
answer
51
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Can a 0.5 W resistor be substituted for a 10 W resistor?
Can a 2 kΩ, 0.5 W resistor be substituted for a 2 kΩ, 10 W resistor?
Also, what kind of defects would occur?
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34
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How do I draw a circuit for a conducting loop inside a solenoid?
To solve a homework problem, I need to redraw the following diagram in circuit form.
The large blue circle represents the solenoid. Inside the solenoid, the two gray semicircles represent a wire loop,...
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votes
1
answer
187
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Inductor Voltage at t=0
In the circuit below, the switch has been in position 1 indefinitely long and suddenly switches to position 2 at t=0. I'm asked to find the initial voltage of the inductor at t=0.
My professor lists ...
- 3
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votes
1
answer
1k
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Line to neutral voltage in three-phase power systems
I have the book "Power system analysis and design" by Sarma.
In his intro to balanced LN voltages, in chapter 2 p62 he states:
$$V_{LL} = \sqrt{3} V_{LN} \angle30º$$
but later in the chapter,...
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3
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217
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Magnetising a needle with static electricity using silk cloth
A nautical navigation textbook on my table says that we can magnetise a non-magnetised needle by rubbing it with a silk cloth. I decided to cross check on the internet, and found some experts calling ...
- 98
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40
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Circuit analysis
enter image description here
I don’t understand what is the Use of ‘Vin’ as its anode connects to the open circuit.So I can’t even solve QA
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votes
2
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151
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Circuit with Contradiction
What would happen in real life if you made a paradoxical circuit (a circuit whose output is on iff its output is off). Something like this:
Would the discrete model break down and the output end up ...
1
vote
0
answers
326
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Charging a 2020 M1 Macbook Pro from a low-voltage solar array
I'm working on a small project to mount solar panels to a Macbook case which would allow it to charge/offset battery consumption.
I noticed that I was able to power the Macbook on public transport ...
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