# Determine the value of the auxiliary resistance, professor showed us, didn't work?

1. Nov 6, 2005

### mr_coffee

Hello everyone, i'm running into a problem getting the last part of this question, part (c). I posted my work here: http://img234.imageshack.us/img234/4353/lastscan4wr.jpg [Broken]
When i applied kurchofs rule i got the following exxpression:
-RsIs + RgIg = 0
RgIg = RsIs
Rs = [RgIg]/Is

Any ideas where i'm messing up at? The professor said its right the way i'm doing it, but he might have missed somthing..

The coil of a certain galvanometer has a resistance of 74.2 ; its needle shows a full-scale deflection when a current of 1.51 mA passes through its coil.

(c) Determine the value of the auxiliary resistance required to convert the galvanometer to an ammeter that reads 50.0 mA at full-scale deflection.
wrong check mark
(d) Should this resistance be connected in series or in parallel?
[in series]

Last edited by a moderator: May 2, 2017
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