Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: robaker on March 06, 2010, 04:17:03 AM

Title: $50 power
Post by: robaker on March 06, 2010, 04:17:03 AM

the grounds of 4,8V and 9v are shared...
Is sharing the ground of 4.8V and 9V battery necessary  ?
If we seperate the grounds of both 4.8 and 9v also , is there any risk?
if not ,how does one know ?

Title: Re: $50 power
Post by: chelmi on March 06, 2010, 08:54:20 AM

they have to be connected. Voltage is not an absolute value, you need a common ground.

Title: Re: $50 power
Post by: robaker on March 07, 2010, 02:03:16 AM

--Voltage is not an absolute value, you need a common ground.--
?? plz explain this line...

Title: Re: $50 power
Post by: SmAsH on March 07, 2010, 02:13:46 AM

I don't understand the first part but, keep the grounds connected, you need this.

Title: Re: $50 power
Post by: cyberfish on March 07, 2010, 02:39:43 AM

Voltage = potential DIFFERENCE - difference in potential energy between 2 points.

Without a common ground, the 2 differences won't do much. You will have essentially 2 separate circuits.

In short, they have to be connected together.