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  • Standards. There Are Many.

    From Klay Anderson@21:1/5 to All on Mon Feb 21 07:58:59 2022
    1 Ohm. Was defined as the resistance of a column of mercury (at the temperature of melting ice) of a uniform cross-section of 1 square millimeter and a length of 106.30 centimeters.

    1 Volt. Was defined as the electromotive force that produces a current of 1 Ampere when steadily applied to a conductor with the resistance of 1 Ohm.

    1 Ampere. Is the unit of current strength. It is the current which, when passed through a solution of nitrate of silver in water (in accordance with certain specifications), deposits silver at the rate of 0.00118 of a gram per second.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From geoff@21:1/5 to Klay Anderson on Tue Feb 22 09:21:04 2022
    On 22/02/2022 4:58 am, Klay Anderson wrote:
    1 Ohm. Was defined as the resistance of a column of mercury (at the temperature of melting ice) of a uniform cross-section of 1 square millimeter and a length of 106.30 centimeters.

    1 Volt. Was defined as the electromotive force that produces a current of 1 Ampere when steadily applied to a conductor with the resistance of 1 Ohm.

    1 Ampere. Is the unit of current strength. It is the current which, when passed through a solution of nitrate of silver in water (in accordance with certain specifications), deposits silver at the rate of 0.00118 of a gram per second.


    Time to calibrate my DMM ....

    geoff

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Ralph Barone@21:1/5 to Klay Anderson on Mon Feb 21 21:02:43 2022
    Klay Anderson <[email protected]> wrote:
    1 Ohm. Was defined as the resistance of a column of mercury (at the temperature of melting ice) of a uniform cross-section of 1 square
    millimeter and a length of 106.30 centimeters.

    1 Volt. Was defined as the electromotive force that produces a current of
    1 Ampere when steadily applied to a conductor with the resistance of 1 Ohm.

    1 Ampere. Is the unit of current strength. It is the current which, when passed through a solution of nitrate of silver in water (in accordance
    with certain specifications), deposits silver at the rate of 0.00118 of a gram per second.


    Kinda fun how the definitions just stack onto other definitions. You need
    to define length and temperature before you can define resistance; you then need to define mass to define current, and once you have those five units defined, voltage falls out.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jake T@21:1/5 to Klay Anderson on Tue Feb 22 10:48:16 2022
    On 2/21/22 10:58, Klay Anderson wrote:
    1 Ohm. Was defined as the resistance of a column of mercury (at the temperature of melting ice) of a uniform cross-section of 1 square millimeter and a length of 106.30 centimeters.

    1 Volt. Was defined as the electromotive force that produces a current of 1 Ampere when steadily applied to a conductor with the resistance of 1 Ohm.

    1 Ampere. Is the unit of current strength. It is the current which, when passed through a solution of nitrate of silver in water (in accordance with certain specifications), deposits silver at the rate of 0.00118 of a gram per second.

    There is precisely 8.25R/hr at 2.54cm distance (Pt absorber) emitted by
    1 mg of Ra. I know because I studied radiology at one time. That
    standard is used to provide radiation therapies to the sick.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jake T@21:1/5 to All on Tue Feb 22 11:35:33 2022
    T24gMi8yMi8yMiAxMDo0OCwgSmFrZSBUIHdyb3RlOg0KPiBPbiAyLzIxLzIyIDEwOjU4LCBL bGF5IEFuZGVyc29uIHdyb3RlOg0KPj4gMSBPaG0uIFdhcyBkZWZpbmVkIGFzIHRoZSByZXNp c3RhbmNlIG9mIGEgY29sdW1uIG9mIG1lcmN1cnkgKGF0IHRoZSANCj4+IHRlbXBlcmF0dXJl IG9mIG1lbHRpbmcgaWNlKSBvZiBhIHVuaWZvcm0gY3Jvc3Mtc2VjdGlvbiBvZiAxIHNxdWFy ZSANCj4+IG1pbGxpbWV0ZXIgYW5kIGEgbGVuZ3RoIG9mIDEwNi4zMCBjZW50aW1ldGVycy4N Cj4+DQo+PiAxIFZvbHQuIFdhcyBkZWZpbmVkIGFzIHRoZSBlbGVjdHJvbW90aXZlIGZvcmNl IHRoYXQgcHJvZHVjZXMgYSBjdXJyZW50IA0KPj4gb2YgMSBBbXBlcmUgd2hlbiBzdGVhZGls eSBhcHBsaWVkIHRvIGEgY29uZHVjdG9yIHdpdGggdGhlIHJlc2lzdGFuY2UgDQo+PiBvZiAx IE9obS4NCj4+DQo+PiAxIEFtcGVyZS4gSXMgdGhlIHVuaXQgb2YgY3VycmVudCBzdHJlbmd0 aC4gSXQgaXMgdGhlIGN1cnJlbnQgd2hpY2gsIA0KPj4gd2hlbiBwYXNzZWQgdGhyb3VnaCBh IHNvbHV0aW9uIG9mIG5pdHJhdGUgb2Ygc2lsdmVyIGluIHdhdGVyIChpbiANCj4+IGFjY29y ZGFuY2Ugd2l0aCBjZXJ0YWluIHNwZWNpZmljYXRpb25zKSwgZGVwb3NpdHMgc2lsdmVyIGF0 IHRoZSByYXRlIA0KPj4gb2YgMC4wMDExOCBvZiBhIGdyYW0gcGVyIHNlY29uZC4NCj4gDQo+ IFRoZXJlIGlzIHByZWNpc2VseSA4LjI1Ui9ociBhdCAyLjU0Y20gZGlzdGFuY2UgKFB0IGFi c29yYmVyKSBlbWl0dGVkIGJ5IA0KPiAxIG1nIG9mIFJhLsKgIEkga25vdyBiZWNhdXNlIEkg c3R1ZGllZCByYWRpb2xvZ3kgYXQgb25lIHRpbWUuwqAgVGhhdCANCj4gc3RhbmRhcmQgaXMg dXNlZCB0byBwcm92aWRlIHJhZGlhdGlvbiB0aGVyYXBpZXMgdG8gdGhlIHNpY2suDQoNCjEg Y20sIG5vdCAyLjU0DQo=

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Les Cargill@21:1/5 to Klay Anderson on Fri Mar 11 18:13:33 2022
    Klay Anderson wrote:
    1 Ohm. Was defined as the resistance of a column of mercury (at the temperature of melting ice) of a uniform cross-section of 1 square millimeter and a length of 106.30 centimeters.

    1 Volt. Was defined as the electromotive force that produces a current of 1 Ampere when steadily applied to a conductor with the resistance of 1 Ohm.

    1 Ampere. Is the unit of current strength. It is the current which, when passed through a solution of nitrate of silver in water (in accordance with certain specifications), deposits silver at the rate of 0.00118 of a gram per second.




    1 watt is easier to measure. You apply it to a thermal element and
    measure temperature over time.

    If you have a watt and you have an ohm, the rest is calibration.

    --
    Les Cargill

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)