# Questions tagged [basic]

Fundamentals of electricity, electronics, components, or theory

371 questions
6k views

### Why voltage lags by 90° from magnetic flux?

I was not sure if I should write it here or on Physics board, but I will give a try. As I understood current (generally emf) can be generated in a system by varying magnetic flux. For example, let's ...
786 views

### Basic nature of electric current/voltage

I'm curious about electronic/electric. I just want some visual, easy to understand explanation/depiction about basic nature of electric current/voltage, relations between them, why electrons make a ...
32k views

### How can I learn electronics at home? [duplicate]

Possible Duplicate: Learning about electronics I am 40. I am an architect by profession. I am very interested in learning electronics. I don't have time to go to college for an electronics ...
5k views

### What's a good way to start learning how electronics and circuits work? [closed]

I literally already tried getting a degree in Electrical Engineering, and I hated it, and I switched to Computer Science. But here's the thing-- I find circuits and electronics and electrical devices ...
5k views

### What is Normalized DC Current Gain (as oppossed to DC Current gain)?

I have a table that presents DC Current Gain for BC548B transistor: and a graph that presents Normalized DC Current Gain: Are those two things related? What does "normalized" mean? Why is the Y-axis ...
38k views

### How electrons inside copper wire behave when source is ac or dc?

When a simple copper wire is connected to AC or DC, what actually happens to the electrons inside the wire? I.e. What kind of path do they follow when they reach the end of the wire? If anyone can ...
336 views

### What is the impedance of this unusual (magnetically coupled) circuit?

Inductors X1 and X2 are magnetically coupled M = 20 [Ohm] X1 = 20 [Ohm] X2 = 30 [Ohm] I am not sure how to interpret short circuit. Is the circuit impedance given by the equation: _Z = R1 + jX1 + ...
11k views

### What is the voltage divider rule?

Can anyone explain what the voltage divider rule is? How has the author of this book used it for analyzing the Voltage Divider Bias circuit for transistors? And can anyone explain how the two ...
53k views

### Why should a circuit be grounded?

Why should a transistor circuit be grounded? The way I understand it is that ground is an infinite supply of electrons and so it is equivalent to the negative terminal of a battery. But in this page , ...
10k views

### Why is the Ampere the only SI fundamental unit for electricity?

According to wikipedia the only SI fundamental unit for Matters Electrickal is the ampere. Don't you at least need the ohm to derive anything? How would you make volts from only amps? Perhaps I ...
12k views

### Principal of Analog to digital converter(ADC) and Digital to analog converter(DAC)

Analog to digital converter is one that converts analog output form sensors to digital one what are basic principal of Analog to digital converter(ADC) and the opposite of one that takes digital input ...
3k views

### What are analog and digital signals?

I came across the concept of analog and digital signals in my data communication course. We studied that analog signals are continuous signals and teacher presented a diagram like the sine wave and ...
30k views

### How does an astable multivibrator LED blinking circuit work?

I am a beginner in electronics. I come to know about the oscillator using RC circuits (capacitor charge and discharge and time constant tells the behavior of circuit). Then I saw the following ...
4k views

### Why we need to complete circuit

Why can't we light an LED with a single positive wire on the anode, leaving the cathode unconnected? Let's suppose I connect a wire with a positive voltage to the anode of the LED. Now, I think, ...
4k views

### Low pass audio filter design

I want my Arduino project to listen to the ambient music and sync its light show output to the beat. It seems that doing BPM detection properly is fiendishly difficult in software, but if your music ...
7k views

### What is an amp (and other such basic questions) in the simplest possible terms?

I understand that this is a really basic question, but, I've been unable to really understand electrical terminology for some reason. What exactly is an amp? How does it correspond to a watt? And: ...
4k views

I'm a computer scientist with zero exposure to things directly related to hardware (barring what I learned from my undergrad computer org class.) I've been very attracted to the field of embedded ...
3k views

### Transistor with two voltage levels, Vb ≠ Vcc

Why is my transistor only driving 5V instead of 6V? How can I fix it? I have a 6V, 25mA circuit running some LEDs. I can control them by connecting and disconnecting the positive terminal of the ...
32k views

### How do I connect two identical batteries to increase the consumer lifetime?

If I've got a device that uses a single battery, and with that single battery, the device lasts an hour, and I want the device to last for two hours, I'm assuming I can wire two batteries up and it ...