prototype_g2@lemmy.ml to xkcd@lemmy.worldEnglish · edit-223 days agoxkcd #3038: Uncanceled Unitsxkcd.comexternal-linkmessage-square12fedilinkarrow-up16arrow-down10file-text
arrow-up16arrow-down1external-linkxkcd #3038: Uncanceled Unitsxkcd.comprototype_g2@lemmy.ml to xkcd@lemmy.worldEnglish · edit-223 days agomessage-square12fedilinkfile-text
minus-squarekittehx@lemmy.blahaj.zonelinkfedilinkEnglisharrow-up0·24 days agoNo, it’s because watts are joules per second, so kWh are (energy / time) * time. Cancelling the units would be expressing the energy directly in joules.
minus-squareRvTV95XBeo@sh.itjust.workslinkfedilinkEnglisharrow-up0·22 days agoBut the XKCD mentions kWh/day specifically, in theory the times can cancel out, leaving you with kW But instantaneous and average kW are very different, and it would take more time to describe that distinction than to use kWh/day.
minus-squarekittehx@lemmy.blahaj.zonelinkfedilinkEnglisharrow-up1·21 days agoOk that’s fair, I kinda glossed over that part. Both are valid interpretations, I think.
No, it’s because watts are joules per second, so kWh are (energy / time) * time. Cancelling the units would be expressing the energy directly in joules.
But the XKCD mentions kWh/day specifically, in theory the times can cancel out, leaving you with kW
But instantaneous and average kW are very different, and it would take more time to describe that distinction than to use kWh/day.
Ok that’s fair, I kinda glossed over that part. Both are valid interpretations, I think.