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# MEASURING RESISTANCE BY A NULL DETECTION METHOD USING A WHEATSTONE BRIDGE

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Introduction

Linda K

PHYSICS II

LAB #8:

MEASURING RESISTANCE BY A NULL DETECTION METHOD USING A WHEATSTONE BRIDGE

Purpose:

The purpose of this experiment was to measure the resistance at room temperature of a lamp.  We also measured the resistance of a cold lamp compared to the resistance of a hot lamp.  We also learned the proper techniques of using the Wheatstone bridge.

Materials and Procedure

Wheatstone bridge

Lamp

Alligator Clips

Voltmeter

DC power supply

Galvanometer

10ohm wood

The first step is to wire the apparatus.  The lamp is wired to the left side of the wheatstone bridge.  One side of the wire is attached on the top of the three

Middle

Data and Results

The Standard Resistance, S,  10.0 ohms

Position I:         L1 = 83.1cm

L1’=82.4cm

Position II:         L2=16.9cm

L2’=17.6cm

The mean length of the wire

“under the lamp”, L1 = 82.75cm

The mean

Conclusion

[1] This then causes the light bulb to draw excessive current until the filament warms up which is demonstrated in the significant differences in the resistance values of the hot and cold lamps.

LAB #7: Measuring Resistance by the Voltmeter Ammeter Method

Date and Results:

Wattage Rating: 75 Watts

The voltage across the lamp: 124.7 Volts

The current though the lamp: .620Amps

R=V/I

R=(124.7V)(.620A)

R=198.3ohms

The resistance of the lamp when hot is 198.3 ohms.

[1] http://www-istp.gsfc.nasa.gov/Education/wfluor.html

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