Education Technology

# Activities

• ##### Subject Area

• Science: Physics: Electrostatics

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™

TI Connect™

• ##### Accessories

CBL™/CBL 2™
Sensor - Voltage
TI Connectivity Cable

• ##### Other Materials
This is Activity 12 from the EXPLORATIONS Book:
Data Collection Activities for the Middle Grades with the TI-73, CBL™, and CBR™

The following materials are required for this activity:
• Seven different types of "batteries", some items that might be good are: potato, lemon, lime, apple, orange, grapefruit, banana, broccoli
• Zinc washer
• Copper penny (1959-1982)
• Knife, to make slots for the penny and washer
• Ruler
• Towel
• Water

## You'll Get a Charge Out of This!

#### Activity Overview

In this activity, students make a battery using different fruits and vegetables, a copper penny, and a zinc washer. They use a voltage probe to collect data on voltage and compare the values of different batteries.

#### Before the Activity

• Install the CBL/CBR Application on the students' graphing calculators using TI Connect™ or a TI-GRAPH LINK™
• Connect the TI-73 to the CBL 2™ unit
• Connect the voltage probe to the CH1 port of the CBL
• See the attached PDF file for detailed instructions for this activity
• Print pages 163 - 178 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to your class.

• Create slits 1 cm apart in the item tested as battery makers
• Insert the copper penny and zinc washer into the slits
• Connect the positive lead to the penny and negative to the zinc
• Observe the readings on the calculator
• Repeat the activity with the other fruits/vegetables and by placing the electrodes at different distances
• Plot a graph of voltage readings versus type of electrolyte
• For each battery set up collect readings every 99 seconds for a period of nearly 3 hours
• Observe the plot of voltage versus time and examine the rate of change in voltage over time
• Create a manual fit for this data
• Identify the item that made the best battery and the battery with the most staying power
• #### After the Activity

Students will complete the Data Collection and Analysis Sheet and answer questions listed in it.

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary