- A. General Materials & Mathematics
- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
- J. Electrostatics & Magnetostatics
- K. Electromagnetic Principles
- L. Geometrical Optics
- M. Wave Optics
- N. Spectra & Color
- O. Vision
- P. Modern Physics
K6-33. Wheatstone Bridge
To demonstrate operation of a Wheatstone bridge.
Two 400 ohm resistors, 0-90 ohm variable resistor, 60 watt light bulb as "unknown" resistor, center zero 0-5 milliamp lecture meter, digital multimeter.
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).