ohms question

[the pict]

In a recent post of mine about alarms ohms were expessed thus 6k8, I have been reading up on alarm systems and this comes up regularly 10k I understans but 6k8. 7k2 etc at first I thought it mean 7.2Kohms etc but now I am not so sure
Pict

 

[Silly Sausage]

I alway thought it couldnt get ANY colder than 0 deg K
Just got back from the pub BTW.

Hahaha...it can't. I'd go back down the pub if I was you, I'd join you if I could afford it!

 

[the pict]

Dead right it is expressed as K as in TD=4K never under stood why though but I was told it is used when applying certain calculations bit like algebra I suppose another language I cant understand
Pict