# Tag Info

Accepted

### Is there a physical limit to data transfer rate?

tl;dr- The maximum data rate you're looking for would be called the maximum entropy flux. Realistically speaking, we don't know nearly enough about physics yet to meaningfully predict such a thing. ...
• 4,660

### Is the voltage ever undefined?

The voltage between to points in the universe is always defined. But the voltage between two circuits is undefined because (at least from electronics point of view) circuits are abstract models of ...
• 631

### How do computers store sound waves just by sampling the amplitude of a wave and not the frequency?

"Amplitude" is the wrong word. The amplitude of a periodic function is the difference between its greatest value and its least value. Cross out "amplitude" from your textbook, and ...
• 15.3k

### How is data transferred between devices?

It is less of a "sending electrons," and more of jiggling them. Think of a wave, done by the crowd at a sporting event. One person raises their hands high, and then sits back down. The ...
• 50.3k

### How do headphones and earphones produce good bass if tiny speakers can't produce low frequency sounds very well?

There are a few reasons why small speakers have trouble creating bass. Bass is directly proportional to the amount of air the speaker can move. So you want a large cone that can move a large distance....
• 3,989

### How do computers store sound waves just by sampling the amplitude of a wave and not the frequency?

A slight clarification on Solomon Slow's complete answer: If you sample the original signal frequently enough, the instantaneous values you measure at each of those tiny time slices will actually ...
• 96.1k

### Is there a physical limit to data transfer rate?

The Shannon-Hartley theorem tells you what the maximum data rate of a communications channel is, given the bandwidth. $$C = B \log_2\left(1+\frac{S}{N}\right)$$ Where $C$ is the data rate in bits ...
• 471

### Does a Mobius resistor have zero inductance? How would you calculate the inductance?

The inductance can be calculated, but it is first necessary to look at the behavior at very fast timescales of a ns or so. Clearly the two faces of the strip form a transmission line and so, at short ...
• 589

### How do computers store sound waves just by sampling the amplitude of a wave and not the frequency?

Your instinct is correct, there are two degrees of freedom here so we have to measure two quantities. The one you are missing is the timestamp. We are measuring both the voltage of the signal and ...
• 507

### Why does a capacitor act as a frequency filter?

An capacitor has one intuitive property: Its voltage can't change instantly since its voltage is dependent on the charge it has stored, and charge doesn't move at infinite speeds (there is always ...
• 9,319

### How is data transferred between devices?

I have drawn a diagram to illustrate the mechanisms of how telecommunications work. This is a highly simplified cartoon of what happens. What Iâ€™ll be describing is in part often described in Telecom ...
• 948

### Why does an MRI machine or other EMP generating machine not damage humans, but it will fry computers?

Y'know that spark that jumps between your finger and a doorknob on a dry day in winter? That spark is enough to break down the "gate oxide" insulator between the gate electrode and the body ...
• 15.3k
Accepted

### Why is it easier to raise AC current to high voltage than DC?

Changing the Voltage of AC can be done with a simple iron core transformer. That's a simple device without moving parts that only consists of a magnetic core, copper wire and some isolation (...
• 866
Accepted

• 26.6k
Accepted

### Main cause of self-charging of unshorted capacitors?

The phenomenon you are talking about is called dielectric absorption. The way it works is this: Let's say you've just discharged a capacitor. An ideal capacitor would remain at zero volts after this. ...
• 7,057