- Sections
- 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
K6-32. Potentiometer
Purpose
To find an unknown EMF using a voltage divider.
Equipment
Slide wire potentiometer, 7.5, 6, and 1.5 volt batteries, 5 amps DC center zero projection meter, knife switch and momentary switch.
Setup Time
5 minutes.
Images
Description
A 7.5 volt battery (voltage V) is connected across a resistive wire of length L. A second "unknown" lesser voltage can be determined experimentally as follows: Connect the second source, with the same polarity as the standard source, to one end of the test wire through a galvenometer and a key switch to a clip lead. Find the distance L(1) along the wire where the clip lead draws no current. The unknown voltage V(u) is then: V(u) = V L(1) / L.
-
See pagesk1. forces on moving charges
-
See pagesk2. electromagnetic induction
-
See pagesk3. transformers
-
See pagesk4. motors & generators
-
See pagesk5. electrical properties of matter
-
See pagesk6. electric circuits & instruments
-
See pagesk7. rlc circuits
-
See pagesk8. electromagnetic waves
-
See pagesk1. forces on moving charges
-
See pagesk2. electromagnetic induction
-
See pagesk3. transformers
-
See pagesk4. motors & generators
-
See pagesk5. electrical properties of matter
-
See pagesk6. electric circuits & instruments
-
See pagesk7. rlc circuits
-
See pagesk8. electromagnetic waves