# Definitions of some variables

**URL:** <https://forum.universal-robots.com/t/definitions-of-some-variables/15495>\
**Category:** Technical Questions\
**Created:** [July 15, 2021, 10:53pm UTC](https://forum.universal-robots.com/t/definitions-of-some-variables/15495 "2021-07-15T22:53:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ytang116](https://avatars.discourse-cdn.com/v4/letter/y/958977/32.png) [@ytang116](https://forum.universal-robots.com/u/ytang116)\
**Post date:** [July 15, 2021, 10:53pm UTC](https://forum.universal-robots.com/t/definitions-of-some-variables/15495/1 "2021-07-15T22:53:39Z")

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I’m using the RTDE module to save the data.  
I want to get the voltage and current of the robot.  
There are some similar names.  
For instance, actual\_main\_voltage, actual\_robot\_voltage and actual\_joint\_voltage. It seems they are very close to each other, around 48 V.  
As for the current: actual\_robot\_current, actual\_current. they are totally different from each other.

Is there anyone who can tell me the difference between each other?

Thanks!