Dear Joe and Robert, I have interspersed some remarks.
on 2002-07-13 09.58, Joseph B. Reid at [EMAIL PROTECTED] wrote: > Robert Bushnell wrote in USMA 20994: > >> 2002 July 12 >> Madan; >> In 20959 you tell Claire to give energy in units of TWH. >> >> This is wrong. I agree that TWH is the wrong choice of unit for comparing the quantity of energy from various sources. Further I would suggest that since any publication that uses TWH is obviously intended for an audience that should be able to handle technical issues then I would suggest that the SI unit, joule (with an appropriate prefix) would be a much more preferable choice of unit. >> The watt hour is allowed only for electricity. I also understood this to be true � and then this is not necessarily true for all nations. Joe may be right when he says 'The watt hour is a non-SI unit accepted for use with the International System', but this would only be true in individual nations that have legislated accordingly. For watt hour to be 'allowed' it requires specific legislation in each nation; the blanket rule that a nation uses the International System of units does not specifically provide for non-SI variations such as the watt hour. Personally, I have never seen the watt hour or the kilowatt hour used in any context except electricity (and I hope I never do). >> Energy is given in multiples of joule. >> >> Further, the symbol for hour is h, not H. >> >> Robert Bushnell > > > Nonsense! The watt is the SI derived unit for all kinds of power - > mechanical, electrical or thermal. Agreed that the joule is the SI derived > unit of energy and is equal to the watt second, again not exclusively > electrical. The watt hour is a non-SI unit accepted for use with the > International System. The amp�re is the SI electrical base unit and all SI > electrical derived units involve the amp�re. > > Joseph B.Reid > 17 Glebe Road West > Toronto M5P 1C8 Tel. 416 486-6071 >
