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Hi, i assign 460 GWh to a E variable (Giga Watt hours). Then I want to see it in kWh (or MWh). Trying to write E='MWh results as on picture (units are not recalculated by prefixes). Is it normal? Do I have to add my own calculation among prefixes to obtain proper recalculation?
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Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,652 Location: Italy Was thanked: 1339 time(s) in 878 post(s)
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Originally Posted by: m227 Is it normal? Do I have to add my own calculation among prefixes to obtain proper recalculation? Yes, units prefixes are built-in (a variable must be declared in units.xml to accept the proper multipliers... so f.e. you can't have automatically gigakelvin or megaseconds) SI standard commercial/practical user-defined Edited by user 12 April 2018 20:15:43(UTC)
| Reason: fixed hour unit |
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Originally Posted by: Davide Carpi Yes, units prefixes are built-in (a variable must be declared in units.xml to accept the proper multipliers... Interesting but rather confusing. What is MW h In lot of maths MW h is implicit of MW*h Rather not same MW/h
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Originally Posted by: Jean Giraud In lot of maths MW hr is implicit of MW*hr Rather not same MW/hr I guess it is possible to make it MW/hr
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Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,652 Location: Italy Was thanked: 1339 time(s) in 878 post(s)
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Originally Posted by: Jean Giraud In lot of maths MW h is implicit of MW*h Rather not same MW/h Two very different things [W*h]=[J] while [W/h]=[J/s^2] However, yes, can be done even this (CTRL+K to add the backslash): |
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Thank you Davide. I just realized that my unit is not a standard unit but multiplication of two. I found it out when tried to convert my results to Joules (J). So you're right, it is enough to use kW*h instead of kWh. I buy it. Btw. unit like kW/hr and W/s (Watts per time) are rather nonsense as W is already given in a time span (J/s). Edited by moderator 13 April 2018 13:31:12(UTC)
| Reason: marked as solved
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Originally Posted by: m227 Btw. unit like kW/hr and W/s (Watts per time) are rather nonsense as W is already given in a time span (J/s).
Hi "M". Just not so fast. J/s^2 can be seen as the power acceleration, like the normal "acceleration", meter by second square. It could be practical in an electrical circuit for study the variation of p(t)=v(t)*i(t) (in lowercase, which means instant values). Usual electrical protections only study the "R by I square curve" and how the current increase in time (and remember that i=dq/dt), but one must to remember that Ohm's law isn't a "true" law: it's just a practical rule, which works only ... if it works, but isn't a natural principle, like Newton's laws. Best regards. Alvaro.
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A while ago I requested Engineering Exponents/Notation. https://en.smath.info/fo...-displaying-results.aspxYou would probably find that would meet your needs also. Even of the exponents were coerced to 3s, it would probably help - I personally find it much easier when the exponents are in 3's, even if the prefixes aren't used
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