Vernier Software and Technology
Vernier Software & Technology


Figure from experiment 11 from STEM 2 with Vernier and LEGO® MINDSTORMS® NXT


A battery is an electric storage device. Batteries come in many shapes, sizes, and voltages. No matter what their shape, however, all batteries have two terminals—positive and negative. Some batteries have both terminals on one end. AAA, AA, C, and D batteries, however, are built with the terminals at opposite ends. The positive terminal is on the end with the bump; the negative terminal is on the flat end. Inside the battery, a chemical reaction produces electrons that collect on the negative terminal.

Placing a wire between the two terminals causes a stream of electrons, called current, to flow. Voltage is a measure of the energy difference between two points in a circuit. Current and voltage can be difficult concepts to understand so some people compare them to water pipes. Current relates to the amount of water flowing in a pipe, while voltage relates to the water pressure. New household batteries have voltage values ranging from 1.5 to 9 volts; but after repeated use, the voltage decreases to the point where they are no longer able to supply enough current. In many battery-operated devices, such as calculators and digital cameras, you do not use just one battery. You group them together to form higher voltages. In Part I of this activity, you will learn to identify the different parts of a battery and you will investigate the different ways a Voltage Probe can be positioned. In Part II, you will use a Voltage Probe to measure the voltages of several different sizes of batteries. In Part III, you will measure the voltages of batteries as they are stacked together.


In this experiment, you will

  • Use a Differential Voltage Probe and NXT to measure battery voltage.
  • Make observations about the size of different batteries.
  • Measure the voltages of batteries as they are stacked together.

Sensors and Equipment

This project/activity features the following Vernier sensors and equipment.

Additional Requirements

You will also need NXT Sensor Adapter and a LEGO MINDSTORMS NXT robotics system.

Standards Correlations

See all standards correlations for STEM 2 with Vernier and LEGO® MINDSTORMS® NXT »

STEM 2 with Vernier and LEGO® MINDSTORMS® NXT

See other experiments from the lab book.

2First-Class Levers
3Audio Assistant
6String Tension Tester
7Gas Pressure
8Yeast in Action
9Grip Strength
10Cartesian Diver
12Lemon Battery
13Battery Tester
14Solar Cells
15Solar Tracker
16Mapping a Magnetic Field
18Migrating Robot
19Magnet Finder
20Mine Sweeper

Project/activity 11 from STEM 2 with Vernier and LEGO® MINDSTORMS® NXT Lab Book

<em>STEM 2 with Vernier and LEGO<sup>®</sup> MINDSTORMS<sup>®</sup> NXT</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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