Charging Up, Charging Down - Charging a Capacitor
Recommended for grades 9–12.
Introduction
A capacitor is an electronic component used to store electrical energy. Many of the devices you use on a daily basis, such as your calculator, rely on capacitors as part of their electronic circuitry. Cameras use capacitors, too. Before using an electronic flash, energy is transferred from the camera battery to a capacitor. That energy quickly dissipates in the flash unit when you press the shutter release. The result is a bright flash!
In this activity, you will collect voltage data from a discharging capacitor using a Voltage Probe. The capacitor will be connected to another circuit element called a resistor, which controls the rate at which the capacitor discharges. You will then compare the exponential model to the data you collect.
Objectives
- Record potential versus time data for a discharging capacitor.
- Model potential data using an exponential function.
Sensors and Equipment
This activity requires each of the following Vernier sensors and equipment (unless otherwise noted):
Additional Requirements
You may also need an interface and software for data collection. What do I need for data collection?
Download Experiment Preview
The student-version preview includes:
- Step-by-step instructions for computer-based data collection
- List of materials and equipment
Note: The experiment preview of the computer edition does not include essential teacher information, safety tips, or sample data. Instructions for Logger Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments.
Standards Correlations
See all standards correlations for Real-World Math with Vernier »
Included in the Lab Book
Vernier lab books include a CD with word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.