Search results

  1. K

    Relationship between Voltage and Current

    It depends what you are holding constant. If you hold power constant (which is virtually never the case), then V and I are inversely proportional. If you hold resistance constant (which is much more often the case, including power lines), then they are directly proportional. In the case of...
  2. K

    How does electricity create sound waves?

    High-pitched sounds can also be heard from mechanical relays rapidly switching on and off.
  3. K

    Does electricity have momentum?

    Yes, moving charges do have momentum. But it is inconsequential in most circuits.
  4. K

    If I'm thinking about this correctly, the voltage difference in a

    None. Just like any other measuring device, it must interact with what's being measured in order to report anything. Technically speaking you cannot measure any electrical characteristic with zero interaction between the measurement device and the sample being measured. Fundamentally...
  5. K

    If I'm thinking about this correctly, the voltage difference in a

    The short answer is that current does flow in that circuit. In fact, the current makes the hot side cool down and the cold side warm up (this is known as the Peltier effect), so one must have a constant heat source. Think about it this way: if you were using a thermocouple to measure the...
  6. K

    I always hear the term with electrolytes!

    Well, I usually only lick my calves, and sometimes my lower back. I guess those areas aren't very salty, so I hadn't noticed.
  7. K

    I always hear the term with electrolytes!

    I always hear the term "with electrolytes!" I always hear the term "with electrolytes!" thrown onto sports drink labels. What does this mean? Is it really useful for athletes? I thought electrolytes were chemicals that conducted electricity as a liquid - but it's been a long time since chem...
  8. K

    Magnets For Energy

    A rookie mistake is neglecting the work done to move the magnets to their position in the first place. "when you put them together" = you need to do work on the magnets "they repel" = they in turn do the same amount of work back on their surroundings
  9. K

    Refrigerator Magnet

    Please provide a Link?
  10. K

    Capacitor Analogy

    Capacitance That article is a little iffy. It's not wrong, but neither is the textbook definition. Of course capacitors have no net charge change. This can be seen simply from the sign convention that one plate has charge +Q and the other has charge -Q. However, each plate does...
  11. K

    Resonant frequency of millimetric objects

    I'm a little confused by this. Since when are animals of uniform density?
  12. K

    Magnetism: 12.5 kiloGauss = lbs pull

    Gauss is a measure of magnetic flux density. Pounds are a unit of force. There is no simple conversion because they are not measurements of the same thing. In order to compare them, you would need to know more information about how and the measurements were taken.
  13. K

    What does resonance frequency mean?

    Furthermore, palladium is simply an element. I don't know a lot about palladium, but it can be used in a number of different compounds, and may even have several allotropes. For every molecular configuration, there is a new natural frequency. I highly doubt that palladium, having a bulk...
  14. K

    What does resonance frequency mean?

    Jacquesl, this isn't about you at all. We just don't understand 100% what you are asking, and there is a very good chance you don't understand what you are asking. Everything has a natural frequency, what is also referred to as a normal mode. It is a frequency at which the amplitude of a wave...
  15. K

    Electric discharge - Sound?

    A sound wave is molecules of air pushing and pulling other molecules of air. That's how sound moves through any medium.
  16. K

    Questions about magnets.

    If you were to cut a long magnet in between where you think the south and north poles are, you would end up with two magnets, each with a N and S pole.
  17. K

    Question concerning the nature of charges

    So bascially you are looking for a reason or lack of reason that all charges are what they are? What makes (or does not make) all negative chargers the way they are? Also, your explanation of psychological colors was amazing! I have tried to explain to people time and time again that red...
  18. K

    Harmonics are integer multiples of a fundamental frequency

    The problem is a speaker making that low of a sound. I could put a subwoofer in a closet, and that would help, but it still couldn't go below audible.
  19. K

    Harmonics are integer multiples of a fundamental frequency

    Alright, I was unclear about the whole "15Hz and 30Hz harmonic" thing. Let me put it this way. When someone plays a 200Hz note on a guitar and then a 100Hz note, I know and can hear the 100Hz tone is lower (even though I am hearing a 200Hz harmonic from this one). Now, say these two notes...
  20. K

    Harmonics are integer multiples of a fundamental frequency

    I understand that harmonics are integer multiples of a fundamental frequency. Also, that the relative strengths of the harmonics are what make the same note on different instruments sound different. Why are these other frequencies made? How many integer multiples are there? Why do our...
  21. K

    Dimensions of K (the constant in Coulomb's Law)

    Thanks rbj, that helped a lot.
  22. K

    Simple Question about Photodiodes [Current and Voltage] And yes, current and voltage are mutually inclusive, but it's different when you think about having no resistance.
  23. K

    Voltages move molecules?

    I was involved in a hot debate about burning-in of audio cables. It's a line that many cable manufacturers have used for years and years, and they basically tell unsatisfied customers "You have to use the cables for over 200 hours before they become accustomed to playing the sound"... Now, I...
  24. K

    Electricity and the shortest path

    Yeah, I tripped the circuits 3 times within about a year when I was little, nearly electrocuting myself, and understanding better than most at an early age how electricity works.
  25. K

    Unit in magnetism

    Hey all, we are doing a unit in magnetism right now in school...some of it really baffles me. like why a metal coil when induced with a current and placed over a magnet will spin. And another thing I don't get is: If you take a magents with a N and S end, and cut it in half, you get two...
  26. K

    Protons and electrons

    Yup. It's the strong force i believe that holds atoms together. Either that or the weak force. But it's one of the two, because the electromagnetic forces are huge and must be fought by something!
  27. K

    Magnets n absolute zero

    Just curious, how is magnetic attraction measured?
  28. K

    Magnets n absolute zero

    chroot, take it easy. Man, i think if this forum was real life you'd be a serial killer. i mean, sure, it is impossible...but dont get so upset. Lets simplify and just ask how the attraction of a magnet to cold iron compares to the attraction of a magnet to warmer iron. Besides - what's...