Ideal and Real Batteries

Identifier: E&M: C - 015

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

Concept Overview:

Visualization of internal resistance created by a battery

Step(s) to Follow	Expected Result
Set power supply to 9V. Connect the 2 lamps to the power supply. Add the 3rd bulb.	Bulbs do not dim - current increases to ~5 A
Connect the 2 lamps to the 9v battery. Measure and note the voltage drop across 1 bulb. Add 3rd bulb in parallel. Measure and note the voltage drop across 1 bulb.	Bulbs will dim as the 3rd bulb is added; voltage drop will increase

Tutorial: Set-up Instructions for E&M: C - 15