Biomedical Instrumentation Systems
1st Edition
ISBN: 9781133478294
Author: Chatterjee
Publisher: Cengage
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There is a series type ohmmeter, designed to operate on a 6 V battery. The galvanometer has an internal resistance of 2000 ohms and requires a current of 100 μA for full full scale deflection. The value of R1 is 49 k ohms. If the battery voltage has dropped to 5.9 V, determine the necessary value of R2 to zero the meter; b) According to the conditions indicated in the previous paragraph, an unknown resistance is connected to the meter giving a deflection of 60%. Calculate the value of the unknown resistance.
If you wish to decrease the amount of current in a resistor from 240mA to 180mA by changing the 24V source, what should be the new voltage setting be?
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