Physics Demo Manual

Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

Electrostatics  Electric Fields And Potential  Capacitance  Current and Resistance  Electromotive Force And Current  DC Circuits  Magnetic Materials  Magnetism  Inductance   video  - Back EMF in an Inductor   video  - LR Circuit w/ Function Generator  LR Circuit w/ Battery   video  - Ringing LC Circuit w/ Function Generator  Ringing LC Circuit w/ Battery  Induction  Complex Circuits  Semiconductors And Tubes  Transmission Lines and Antennas

LR Circuit w/ Battery Purpose: To illustrate the various properties of a simple LR circuit during initial charging, subsequent discharging or sudden open circuit. General setup shown in first & second image. Procedure: Charging LR: Flip main switch to add double D-cell (3V) battery to circuit. As shown in third image below, blue trace (Channel-2) measures voltage drop across resistor, yellow trace (Channel-1) measures reverse (inductor point of view) voltage drop across inductor. Notice red (+) and black (-) leads across L. Discharging LR: Before switching "out" the D-cell batteries, close "short circuit switch" then flip main switch to remove batteries from circuit. As shown in forth image below, blue trace (Channel-2) measures voltage drop across resistor, yellow trace (Channel-1) measures reverse (inductor point of view) voltage drop across inductor. Open Circuit LR w/ back EMF:Before switching "out" the D-cell batteries, make sure "short circuit switch" still remains open, then flip main switch to remove batteries from circuit. As shown in fifth image below, blue trace (Channel-2) measures voltage drop across resistor, yellow trace (Channel-1) measures reverse (inductor point of view) voltage drop across inductor.