Ideal and Real Batteries

Demo

Power Supply, 3 bulbs in parallel, a 9V battery, a multimeter

Concept Overview:

1. Visualization of internal resistance created by a battery

Lecturer Procedure
Step(s) to Follow Expected Result

1. Set power supply to 9V.

2. Connect the 2 lamps to the power supply.

3. Add the 3rd bulb.

Bulbs do not dim - current increases to ~5 A

1. Connect the 2 lamps to the 9v battery.

2. Measure and note the voltage drop across 1 bulb.

3. Add 3rd bulb in parallel.

4. Measure and note the voltage drop across 1 bulb.

Bulbs will dim as the 3rd bulb is added; voltage drop will increase

 

Identifier: 
E&M: C - 015