x - Balliol College - University of Oxford
x - Balliol College - University of Oxford
x - Balliol College - University of Oxford
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WR Moore - July 2011<br />
Revision 2 Part B<br />
generators which supply, say, a sine wave. Inside these are a<br />
number <strong>of</strong> circuit components. However as far as the outside world<br />
is concerned they can be modelled in exactly the same way: as a<br />
voltage, V s and a resistance. The resistance is <strong>of</strong>ten called the<br />
source resistance, R s or the output resistance, R out . An example is<br />
shown in the figure below.<br />
i) If V s = 5V what is the voltage at XX’ in the circuit as shown This<br />
is called the open circuit voltage since there is an open circuit<br />
across the terminals.<br />
ii) What is the voltage across the terminals XX’ if R s is 10 and a<br />
resistance <strong>of</strong> 100is connected across them<br />
iii) In another source generating the same voltage a resistance <strong>of</strong><br />
100 across XX’ results in a terminal voltage <strong>of</strong> 4.9V. What is R s
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