Recent content by pumila

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    What's different on electron level when voltage is higher?

    Thinking about it, the originator is more likely interested in the effects within a resistor, so my reply should probably be ignored - just been doing a lot of crunching with low energy electron beams so took that context. I think there is also a difference in approach - I would take the emf as...
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    What's different on electron level when voltage is higher?

    An electron flow through a resistive circuit component is different to electron flow in space charge devices. In the former you will get a balance speed where the kinetic energy increase from the driving voltage is balanced by the kinetic energy loss from interaction with the conducting matrix...
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    Uncovering the Mystery of the Tongue's Extensive Lymphatic Drainage

    Is it that the lymphatic system has to do with drainage of excess fluid from tissue and the tongue has a high blood flow? The lymph nodes are infection control entities within the lymphatic drainage system but the major function of the system is fluid drainage.
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    Electric Potential in circuits

    The voltage between two points is the product of the current times the resistance. The resistance of an ideal conductor is zero, so no matter how much current flows the voltage is zero. If you have a perfect conductor between the battery and the lamp, then the lamp, then a perfect conductor...
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    Increasing amperage in simple circuit

    That's clearly 3.3 US gallons, not Imperial gallons. Battery is fine because it is holding its voltage. Pump is not delivering rated flow, but from current is not trying to do much. Does sound from what you say that, given low power consumption, you are definitely having air or cavitation at...
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    A Curious Question about LCD Display

    Magenta is mix of blue and red light; add green and you get white. Purple is mix of blue and red pigments; add yellow and you get a muddy dark colour. First is additive colours, second is pigment (subtractive) colours. Red green and blue are additive primary colours, red yellow and blue are...
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    What Causes the Rocks to Slide on Death Valley's Racetrack Playa?

    Anyone looked at dreikanters / ventifacts? These are wind-blown stone which can look similar to the pic in the wiki article. They are four sided, with surfaces etched into them and polished by windblown sand. If the mass of the stone is changed enough by the etching they will turn over and...
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    Increasing amperage in simple circuit

    This does not add up. Pump is rated at 7A at 12v to deliver 3.3 gallons per minute. It is at 12v and a bit and is drawing only 1.84A for 1.07 gallons so is clearly lightly loaded and nowhere near capacity. So the reason for the reduced flow is not a blockage or impediment or high working head...
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    What's different on electron level when voltage is higher?

    Electron energy is proportional to the voltage, and speed to the root of voltage. Higher voltages 'fling' electrons faster - but bear in mind that electron speeds in most circuits are in fact quite low.
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    A Curious Question about LCD Display

    The pixels can be quite small, so you can get a hair significantly blocking some pixels. Each pixel is either red, green or blue. Blocking a green pixel will result in a magenta 'fringe' at the side of the hair. Often, depending on orientation, you will see a cycling of colour 'fringing' along...
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    Can AC Currents Be Added in a DC Circuit?

    You can add the complex numbers that represent current and phase.
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    What's different on electron level when voltage is higher?

    Amperage is proportional to the number of electrons per unit time. Voltage is related to the kinetic energy of each electron - increasing the voltage in the circuit increases the electric field at the electron, increasing its acceleration within that field and so increasing its kinetic energy.
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    Living on lightweight meals (Disaster?)

    Depends on the climate and time of year, as well as the duration of the outage. Also how active is the individual required to be. I don't think one can have a generic solution. In polar regions energy demands are higher, for example. In tropical regions biting insects are likely to present...
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    Longitudinal Wave Equation meaning and derivation

    For any wave that is neither damped nor forced and at constant amplitude, the energy of deflection (spring or pressure energy) plus the energy of motion (kinetic energy) is a constant. Hence when the energy of deflection is zero the kinetic energy is at a max, and vice-versa. As you state.
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    Is there a certain limit of force to a magnetic field?

    I think the limit on field strength is a bit arbitrary. As the current through the coils of an electromagnet increases the relative permeability of the core drops. You can either choose that as a limit or keep increasing the current, when the magnet's field strength will continue to increase but...
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