Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538
Demonstrations are cataloged according to PIRA Bibliography
PLEASE REQUEST DEMOS WELL IN ADVANCE
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.
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Internal Resistance of Batteries
Purpose:To show students that batteries have an internal resistance which can be found experimentally
Procedure:Connect a potentiometer to the leads of a battery and meter the voltage across the battery and the current in the circuit. Make a plot of the voltage vs current. Since V = EMF - I R where R is the internal resistance of the battery, calculating the slope of the curve will give the negative of the internal resistance.