# Homework Help: Help with earth grounding

1. Jul 31, 2008

Hi

I need an explanation of the earth grounding in electric courses

I can't appreciate the role of an earth grounding

does the earth surface really act as a common node for all earth grounded systems?

Can we then send a signal using one wire only??

2. Jul 31, 2008

### mgb_phys

Welcome toPF - you should post this in the HomeWork section

Yes - Remember that although the conductivity of earth isn't all that good, the cross sectional area is quite large.

Yes although there are practical difficulties that mean it isn't that efficent.

3. Aug 1, 2008