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- Body_capacitance abstract "Body capacitance is a physical property of the human body that makes it act as a capacitor. Like any other electrically-conductive object, a human body can store electric charge if insulated. The actual amount of capacitance varies with the surroundings; it would be low when standing on top of a pole with nothing nearby, but high when leaning against an insulated, but grounded large metal surface, such as a household refrigerator, or a metal wall in a factory.Synthetic fabrics and friction can charge a human body to about 3 kV. Low potentials may not have any notable effect, but some electronic devices can be damaged by modest voltages of 100 volts. Electronics factories are very careful to prevent people from becoming charged up. A whole branch of the electronics industry deals with preventing static charge build-up and protecting products against electrostatic discharge. Notably, a combination of footwear with some sole materials, low humidity, and a dry carpet (synthetic fiber in particular) can cause footsteps to charge a person's body capacitance to as much as a few tens of kilovolts with respect to the earth. The human and surroundings then constitute a highly-charged capacitor. A close approach to any conductive object connected to earth (ground) can create a shock, even a visible spark.Body capacitance was a significant nuisance when tuning the earliest radios; touching a tuning knob would couple the body capacitance into the tuning circuit, slightly changing its resonant frequency. However, body capacitance is very useful in the Theremin, a musical instrument in which it causes slight frequency shifts of the instrument's internal oscillators. One of them changes pitch, and the other causes loudness (volume) to change smoothly between silence and full amount.Capacitance of a human body in normal surroundings is typically in the tens to low hundreds of picofarads. That's small, by typical electronic standards. While humans are much larger than typical electronic components, they are also mostly separated by significant distance from other conductive objects. Although the occasional static shock can be startling and even unpleasant, the amount of stored energy is relatively low, and won't harm a healthy person.The Human Body Model for capacitance, as defined by the Electrostatic Discharge Association (ESDA) is a 100pF capacitor in series with a 1.5kΩ resistor".
- Body_capacitance wikiPageExternalLink question42.htm.
- Body_capacitance wikiPageExternalLink ElectrostaticsModeling.html.
- Body_capacitance wikiPageID "5314955".
- Body_capacitance wikiPageRevisionID "556953663".
- Body_capacitance hasPhotoCollection Body_capacitance.
- Body_capacitance subject Category:Biotechnology.
- Body_capacitance subject Category:Capacitors.
- Body_capacitance subject Category:Energy_storage.
- Body_capacitance type Artifact100021939.
- Body_capacitance type Capacitor102955247.
- Body_capacitance type Capacitors.
- Body_capacitance type Device103183080.
- Body_capacitance type ElectricalDevice103269401.
- Body_capacitance type Instrumentality103575240.
- Body_capacitance type Object100002684.
- Body_capacitance type PhysicalEntity100001930.
- Body_capacitance type Whole100003553.
- Body_capacitance comment "Body capacitance is a physical property of the human body that makes it act as a capacitor. Like any other electrically-conductive object, a human body can store electric charge if insulated.".
- Body_capacitance label "Body capacitance".
- Body_capacitance label "مواسعة الجسم".
- Body_capacitance sameAs m.0df2q6.
- Body_capacitance sameAs Q4936889.
- Body_capacitance sameAs Q4936889.
- Body_capacitance sameAs Body_capacitance.
- Body_capacitance wasDerivedFrom Body_capacitance?oldid=556953663.
- Body_capacitance isPrimaryTopicOf Body_capacitance.