# Homework Help: Voltmeter Voltage and Error

1. Feb 14, 2010

### rey242

1. The problem statement, all variables and given/known data
A voltmeter will be used to measure the voltage vA in the circuit below. Assume that the voltmeter has a resistance of 100[ohms] and a full-scale voltage of 20[V].

a) What will the voltmeter read?
b) What is the percentage error in making this reading?

2. Relevant equations
Several equations
(i.e KVL, KCL, Ohm's law, Voltage Divider, Current Divider, etc.)

3. The attempt at a solution
I have a general idea on how to do this but I'm not sure if about a few concepts...
I'm pretty sure that there is no current through the 7 volt source.
I think you can figure Vb can be figured out through KVL but im not sure.
If I cant, then I have to use one part of the circuit to find vb.

Can you check to see if these concepts are correct?

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