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Chapter 17: Problem 81

Using a voltmeter from home or one bor- rowed from your teacher, devise a method of measuring the voltage of a flashlight battery while it is delivering power to the bulb. Compare that voltage with that of a new bat- tery. Also record the voltage as the battery "runs down." Write a report on your results.

Short Answer

Expert verified
The voltage of a flashlight battery can be measured using a voltmeter. The initial voltage readings of a used and new battery may differ, with the used battery generally having a lower voltage. As the battery discharges, there is a steady decrease in voltage over time.

Step by step solution

01

Preparation

To begin this experiment, you will need a voltmeter, two identical flashlights, a full battery, and a bulb. Connect the voltmeter to the first flashlight with the full battery and make sure the circuit is formed correctly before turning on the device.
02

Measure and Record

Turn on the flashlight and record the voltage using the voltmeter. This will be the initial voltage of a fully powered battery. Write down the reading.
03

Comparison

Now replace the initial battery in the flashlight with a new one. Again measure and record the voltage of the new battery while it is delivering power to the bulb.
04

Monitoring

Keep the flashlight turned on until the battery runs down. Periodically record the voltage. This will help you track how the voltage drops as the battery discharges.
05

Report Writing

Write a report on the findings. Include the initial voltage of the used battery, the voltage of the new battery, and how the voltage decreased over time as the battery was used. Discuss potential reasons for why the voltage drops as a battery delivers power.

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