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K6-33: WHEATSTONE BRIDGE 9 years 7 months ago #673

  • zzfixk21
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ID Code: K6-33
Purpose: Demonstrate operation of a Wheatstone bridge.
Description: A Wheatstone bridge is connected as in the circuit below using two (approximately) 400 ohm resistors, a 0-90 ohm variable resistor and a 60 watt light bulb (16.7 ohms cold) with a 6 volt battery and a 0-5 mA ammeter (large lecture meter). The unknown resistance Rx (the light bulb) is: Rx = Rs (R2/R1), where Rs is the resistance of the active part of the variable resistor (equal to the fraction of its length used multiplied by 90 ohms).
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