DaveS
Well-Known Member
I blame the magazines which have a bad habit of printing this pernicious "amps per hour" rubbish. No wonder those without an electrical background get confused.
LED Nav lights
- Thread starter Cornishman
- Start date
simon_sluggett
Well-Known Member
they now have voltage regulators fitted
sighmoon
Well-Known Member
I've ordered some from a seller on ebay (in australia) something like £30 for two (port and starboard) including shipping.
Searush
Well-Known Member
[ QUOTE ]
I've ordered some from a seller on ebay (in australia) something like £30 for two (port and starboard) including shipping.
[/ QUOTE ]
Please report back on the outcome. Thousands will be watching with interest!! /forums/images/graemlins/cool.gif
I've ordered some from a seller on ebay (in australia) something like £30 for two (port and starboard) including shipping.
[/ QUOTE ]
Please report back on the outcome. Thousands will be watching with interest!! /forums/images/graemlins/cool.gif
wagenaar
Well-Known Member
Quote:
Ampere; A current of 1 ampere flowing in two parallel conductors 1 metre apart in a vacuum would produce a force between those conductors of 2 x 10^-7 (ie 0.0000002 ) Newtons per metre length. (pretty unhelpful for practical purposes)
In my old "Handbook of Chemistry and Physics" the ampère is defined as: a tranfer of one coulomb per second. (The coulomb being the unit of electrical charge). They then go on to say that the international ampere is the unvarying electric current which, when passed through a solution of silver nitrate in accordance with certain specifications, deposits silver at the rate of 0.00111800 gram per second. The international ampere is equivalent to 0.999835 absolute ampere. Both these definations are not very useful for practical purposes.
Ampere; A current of 1 ampere flowing in two parallel conductors 1 metre apart in a vacuum would produce a force between those conductors of 2 x 10^-7 (ie 0.0000002 ) Newtons per metre length. (pretty unhelpful for practical purposes)
In my old "Handbook of Chemistry and Physics" the ampère is defined as: a tranfer of one coulomb per second. (The coulomb being the unit of electrical charge). They then go on to say that the international ampere is the unvarying electric current which, when passed through a solution of silver nitrate in accordance with certain specifications, deposits silver at the rate of 0.00111800 gram per second. The international ampere is equivalent to 0.999835 absolute ampere. Both these definations are not very useful for practical purposes.
whipper_snapper
Well-Known Member
Well the international definition of the metre is not of much practical use either. But that doesn't mean it is sensible to say my boat weighs 3 metres and expect people to guess what you mean!
If someone say a device consumes 28 amps when they mean 28 amp hours, that is pretty confusing!
If someone say a device consumes 28 amps when they mean 28 amp hours, that is pretty confusing!
VicS
Well-Known Member
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In my old "Handbook of Chemistry and Physics" the ampère is defined as: a tranfer of one coulomb per second.
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Yes I've got that definition in my copy of "The Rubber Book" as well but the ampere is now defined as one of the base SI units according to the definition I gave (well slightly simplified)
You can find the latest definitions in the on line version of "Kaye and Laby" at
http://www.kayelaby.npl.co.uk/
In my old "Handbook of Chemistry and Physics" the ampère is defined as: a tranfer of one coulomb per second.
[/ QUOTE ]
Yes I've got that definition in my copy of "The Rubber Book" as well but the ampere is now defined as one of the base SI units according to the definition I gave (well slightly simplified)
You can find the latest definitions in the on line version of "Kaye and Laby" at
http://www.kayelaby.npl.co.uk/