# Homework Help: Potential difference?

1. Oct 27, 2008

### sallyishyper

potential difference????

1. The problem statement, all variables and given/known data
picture shown in attachment

The sliders are at the mid-point of the potential dividers.
1. Find the potential difference recorded by a digital voltmeter of infinite resistance connected as the voltmeter V in each circuit.
250/2 = 125
6/250=0.024A and 100/2=50
0.024*125 =3V 10/100=0.1A
0.1*50 = 5V

2. The digital voltmeter is replaced by a moving coil voltmeter of resistance 500 ohms. Calculate the new readings when using this meter.

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For this question I have tried to work out the conductance, then from this the total resistance and Ohms law to find the current. Then using Ohms law again try to find the potential difference, but I came out with an answer of minus 7.

2. Relevant equations
V=IR (i think)

3. The attempt at a solution
"
???????????????????????????????????????????????????????????????????????
For this question I have tried to work out the conductance, then from this the total resistance and Ohms law to find the current. Then using Ohms law again try to find the potential difference, but I came out with an answer of minus 7."

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• ###### phYSICS QUESTION!!!!.doc
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Last edited: Oct 27, 2008
2. Oct 27, 2008

### Redbelly98

Staff Emeritus
Re: potential difference????

#1 looks good.