In geophysics how do you explore the ground before building work. And what has this got to do with electricity?

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when i say electricity i mean resistivity in particular.

Thanks :)

Posted Wed 6th February, 2013 @ 20:42 by Tilly - Team GR
Edited by Tilly - Team GR on Wed 6th February, 2013 @ 20:56

10 Answers

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Are you doing the Unit 3 practical on this? I am and I have the same question :P

Answered Wed 20th February, 2013 @ 11:21 by Anni95
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Yeah it's for unit 3 for edexcel. 

Answered Wed 20th February, 2013 @ 15:02 by Tilly - Team GR
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Yeah same i'm doing that too :) Have you already done the case study and planning? What methods did you focus on in your case study?

Answered Wed 20th February, 2013 @ 15:50 by Anni95
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i haven't done my case study yet. We've got to hand it in the week after we go back so i'm going to do it next week. 

Answered Wed 20th February, 2013 @ 16:23 by Tilly - Team GR
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yeah we're doing the same thing...i'm a bit confused about the practical though :/ do we control the voltage or the current? we use a variable resistor right? whats the dependent variable?

Answered Wed 20th February, 2013 @ 17:55 by Anni95
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Thanks for all the help. So as we change the length of the wire both the voltages and currents will change?  Then to calculate resistance you will calculate it individually for each length by doing voltage/current? Then plot the resisitance against the length, find gradient and multiply gradient by cross-sectional area to get resisitivity?

Answered Wed 20th February, 2013 @ 18:53 by Anni95
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So whats the point of using a variable resistor?

Answered Wed 20th February, 2013 @ 18:54 by Anni95
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Have you thought of the contents of your case study yet? Are you doing anything on archeology or just focusing on geophysics for building work? Are you doing yours on any specific methods? 

Answered Wed 20th February, 2013 @ 18:58 by Anni95
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ohh right...i still don't get the point of using a variable resistor? lol :P if it's not needed why would you use it?

Answered Wed 20th February, 2013 @ 22:39 by Anni95
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There are different methods, you can for example choose to keep the pd constant so you'd need to use a variable resistor for that, but i'm not really sure how that works.

Answered Thu 21st February, 2013 @ 14:34 by Tilly - Team GR