Batteries in Series

Project Number: 102

OBJECTIVE: To show the increase in voltage when batteries are connected in series.

Description: When you turn on the slide switch (S1), current flows from the batteries through the slide switch the 100 ohm resistor (R1), the LED (D1), through the LED (D2), and back to the second group of batteries (B1). Notice how both LED's are lit. This voltage is high enough to turn on both LED's when the batteries are connected in series. If only one set of batteries is used, the LED's will not light up. Some devices use only one 1.5 volt battery, but they make hundred of volts electronically from this small source. A flash camera is an example of this.