Questions tagged [education]

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If the RPM of an AC generator doubles, and its frequency and voltage doubles, how much does its current decrease?

From what I understand, if the rotation rate of an alternating current generator increases, its voltage increases at the same rate... I also have learned that the total power produced increases ...
• 231
1 vote
123 views

LED lights on Christmas card without coin battery?

I’m an elementary / primary school teacher and I would like my students to be able to create Christmas / holiday cards with LEDs, using either copper tape or graphite pens (like circuit scribe) … BUT ...
1 vote
187 views

Where can I find information about "Enhanced Policies and Procedures Exam" for IPC?

I'm taking the CSE test for IPC-J-STD-001 and at chapter 7.Certification Exam Overview, I can see that there are 3 types of tests. Policy and procedure test (10 questions) Closed book test (25 ...
• 1,045
91 views

Output voltage of a step-down voltage regulator (or buck converter)

I've the following step-down regulator: and I'm wondering how to get the following formula for the output voltage: $$V_{OUT} = \frac{T_{ON}}{T_{ON} + T_{OFF}} \, V_{IN}$$ I calculated the current ...
65 views

Definition of current capacity of a voltaic cell

I'm looking for the definition of current capacity of a voltaic cell, but online I found only sentences in which this locution was used without a definiton. Can you tell me what is the definition ...
1 vote
1k views

Battery capacity in mWh instead of mAh [duplicate]

I know that the capacity of a battery is expressed in mAh, i.e. A/s (international system of units). Today I used a command in PowerShell (*) in order to get the battery capacity, but the unit of ...
257 views

TRIAC phase angle control 120 VAC line ripple

I'm working on a phase angle controlled TRIAC dimming circuit (schematic attached below), and I'm seeing a lot of ripple/noise on the 120 VAC input as I near 50% power. I'm wondering what I can do in ...
1 vote
88 views

What type of SMPS is this?

What specific type of SMPS is this? I'm working on troubleshooting no power out. I'm having trouble finding comparable circuits so I can learn how it works. It appears to be some sort of resonant ...
• 67
59 views

Microcontroller to realize a wireless electrical switch - Suggestion [closed]

I hope this is the right place where ask my question. I'm looking for a small microcontroller to realize a wireless electrical switch; can you suggest me any microcontroller to do this please? Thank ...
87 views

Reading recommendations to better understand how to understand the intended function of a circuit

This is a general question. Suppose I have a circuit like below from CircuitDigest: ￼ My supervisor said that about the circuit that.. [The] circuit does actually involve an amplifier, even ...
• 121
1 vote
508 views

Sensitivity (or responsitivity?) of an electrochemical sensor - Definition

I read a paper about an electrochemical sensor where there is the term sensitivity expressed in ampere. What is its definition? I found a IUPAC definition here, but the units are ampere/watt or volt/...
53 views

Different number of bit for the ADC and DAC linked to a $\mu$controller - Electrochemical sensor

I am studying an electrochemical sensor (see figures below please) where the number of the bit of the DAC (Analog Devices AD5685R) is 14, whereas the number of the bit of the ADC (Analog Devices ...
177 views

Pseudobipolar signal example - Analog Devices AD7682

What is a pseudobipolar signal? I read this word in the datasheet below: http://www.analog.com/media/en/technical-documentation/data-sheets/AD7682_7689.pdf Can you show me an example with a plot ...
177 views

Impedance magnitude and phase error - Mathematical formula

Today I read a paper on which there are the terms magnitude error and phase error relative to a comparison between measurements performed with a biosensor and with a benchtop electrochemical impedance ...
229 views

Ion-selective electrode: high input impedance to measure the voltage

I read that an ion-selective electrode has an high impedance ($100 \, M\Omega$) and that it's necessary a high input impedance to measure the electrode voltage. I'd like to understand the above ...
53 views

Impedance response of a linear system is independent of the perturbation amplitude?

I'm studyng electrochemical impedance spectroscopy. On my book there is the sentence: "Impedance response of a linear system is independent of the perturbation amplitude.". Why? If I have a non-...
876 views

Is the Nyquist plot useful in actual electrical engineering?

I am currently doing a course on linear control theory, and we are covering Nyquist Plot to study phase and gain margin. I find myself unable to appreciate this concept. One, the proof of the Nyquist ...
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