Engineering What is the Internal Resistance of a Practical Current Source?

AI Thread Summary
The discussion focuses on calculating the internal resistance (R_s) and the current (i_s) of a practical current source based on measurements taken with an ammeter. The ammeter, with an internal resistance of 10 ohms, shows a current of 11.988 mA without additional resistance, which drops to 11.889 mA when a 1.2 k-ohm resistor is added. The problem emphasizes that for a practical current source, the internal resistance should be represented as a resistor in parallel with the ideal current source. The thread also notes that it was mistakenly placed in the Open Practice Problems forum, indicating it may not receive further attention. Overall, the discussion highlights the need for accurate calculations in practical circuit analysis.
Salman
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PROBLEM:the current at the terminals of a certain current source is measured with an ammeter having an internal resistance R_i=10 ohms and is found to be 11.988 mA ;adding a 1.2 kilo -ohms resistance between the source terminals causes the ammeter reading to drop to 11.889 mA.Find i_s and R_s

NOTE:i_s and R_s constitute a practical current source.i.e R_s is the internalresistance of the source i_s
 
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For a practical current source, the internal resistance should be shown as a resistor parallel to the "ideal" current source.
 
Misplaced homework thread closed for Moderation...
 
Oh duh, this is a way old problem that got put in the Open Practice Problems forum. Dave, I don't think the OP is going to read our replies...
 
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Ha, I just realized what the date was on that.
 

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