Hi guys, im having a problem whit this resistance notation.
for instance I know that 1k ohms mean 1000 ohms. but what does 1k5 ohms mean? what is with the 5 there?
I'll appreciate any help.

 

That is a 1500 ohm resistor, or 1.5K. The 1k5 form insures that the decimal point gets strongly indicated for less ambiguity. With faint print, it's hard to tell 1.5K from 15K.

 

Thnx for your time

 

Hello,

beenthere is right.
You can also see an R or M between the numbers:

Naming Convention

To simplify the writing of large resistor values, the abbreviations K and M are used for one thousand and one million. To keep the convention standard, R is used to represent 0. Because of problems in seeing the decimal point in some printed texts, the 3 letters: K M or R are used in place of the decimal point. Thus, a 2,700 Ohm resistor is written 2K7 and a 6.8 Ohm resistor is written 6R8.

This quote comes from this page, with more info on resistor coding:
http://www.diyaudioandvideo.com/Electronics/Color/

This is a link from the EDUCYPEDIA page on component coding:
http://www.educypedia.be/electronics/datacomponent.htm

Bertus