(two 45-minute periods), Subject Areas: (Show students the attached Saltwater Circuit Presentation [PowerPoint].). 5. 7. This website uses cookies. Review worksheets to gauge students' mastery of the subject matter. 4. — An ion is an atom that has an electrical charge, either positive or negative. Students learn about the techniques engineers have developed for changing ocean water into drinking water, including thermal and membrane desalination. Learn how your comment data is processed. Create a free website or blog at WordPress.com. Measure and cut three pieces of wire about 6 to 8 inches long. 3. For lower grades, only use visual observations (eliminate the multimeter). Reflection: Have students answer questions about concepts learned and their participation in the Reflection Worksheet. Why Does the Saltwater Circuit Work? Attach the other long piece of wire to the – terminal of the battery. Once again, lower the electrodes into the solution until the ends are partially submerged. If they touch, the battery overheats and can cause severe burns. Because of the simplicity of the gadget, it can provide only up to eight hours of light, and the anodes will need to be replaced every six months. The presence of sodium and chloride ions carries electricity through the water, completing the circuit. School science experiment 3rd.) 3) Students will recognize the charged property of ions. Understanding the dangers and opportunities of mixing electricity and water helps engineers design for safety as well as creative measurement tools. In fact, we are going to join water and electricity in a special way that is safe. No. As a result, a sodium ion and a chlorine ion are formed. voltage: Electrical potential difference, measured in volts (V). If you submerge the electrodes in regular tap water, the light bulb does not turn on because no medium exists to transfer electrons from one side of the water to the other. Data Collection Have students insert both electrodes in one saltwater solution (without touching electrodes) and observe how bright the light bulb becomes and record the current reading from the multimeter. Once this is done, the light bulb should light up. Connect one wire to each electrode using electrical tape. 3) Students will recognize the charged property of ions. Browse the NGSS Engineering-aligned Physics Curriculum hub for additional Physics and Physical Science curriculum featuring Engineering. Accessed May 1, 2010. http://pbskids.org/zoom/activities/sci/saltwatertester.html, Wikipedia.org, Wikipedia Foundation Inc., Accessed May 1, 2010. Depending on the light, you might have to test a few different areas to see which are the + and – part of the lightbulb. i.e., most hands-on activities are part of lessons, lessons are grouped into multiday units and these again are bundled into subject areas. Here are some of the common ones. Does more salt in the saltwater circuit mean that light bulb will be brighter than if less salt is used? 5. Yahoo fait partie de Verizon Media. 7), Construct and interpret scatter plots for bivariate measurement data to investigate patterns of association between two quantities. Use electrical tape to connect a wire to the black wire of the 9-volt battery cap (see Figure 3-left). Create two saltwater concentrations, one that allows the light bulb to turn on but stay dim and another selected to allow the light bulb to be bright. If the circuit does not conduct electricity, then no significant amount of salt is present in the water. Most curricular materials in TeachEngineering are hierarchically organized; Lighting a Light Bulb With Salt Water Objective: 1) Students will light a light bulb by completing a circuit using a beaker of salt water 2) Students will explain why adding salt to water allows the water to conduct electricity. Well, today we are going to build a saltwater circuit and we are going to investigate the conductivity of saltwater. Pour the distilled water in the beaker until it is half full. Zoom-Saltwater Rocks. Any reusable equipment that is necessary to teach the activity is not included in this estimate; see the Materials List/Supplies for details. 6. (right) Then connect one electrode to the miniature light bulb socket.copyrightCopyright © Juan Ramirez Jr., ITL Program, College of Engineering, University of Colorado at Boulder. (left) Make electrodes by wrapping large Popsicle sticks in aluminum foil and attaching wires. Meanwhile, for a medium-sized salt lamp, light bulbs of 25 watts is a perfect choice. This flow causes the light bulb to light up. (Grade Repeat this set-up for as many groups or students that will be performing this experiment. When the battery is connected and the electrodes are touched together we have a closed circuit and electrons flow from the positive terminal of the battery to the negative terminal of the battery. This completes the circuit, allowing electricity to flow from one terminal of the battery to the other, and illuminates the light bulb in the process. Insert the bare wire around the socket terminal and tighten with a screwdriver. ion: An atom that has an electrical charge because it has either gained or lost an electron. For upper grades, allow students to select several salt-to-water ratios to test electrical conductivity. Saltwater Circuit — A saltwater circuit consists of a battery, wire, light bulb, light bulb socket, and two electrodes (see Figure 1). Make sure the bare end of the wire touches the aluminum foil (see Figure 2-left). Mijeno decided to look into the most abundant of resources on the islands- saltwater, and try to utilize it into an eco-friendly plug-free light source. In addition, the amount of salt in the saltwater solution influences how much current flows through the circuit, and in turn, how bright the light bulb glows. Do you agree with this alignment? Wrap aluminum foil around two sticks. Individually wrap two large Popsicle sticks in aluminum foil (see Figure 2-left). However, the makers hope to be able to bring 600 SALt lamps to Filipino tribes a lot earlier than that. The inspiration for the SALt lamp came to Mijeno after spending some time with local Filipino tribes on the islands of the Philippines. If you increase the amount of salt in the saltwater solution, the light bulb becomes brighter. They learn how processes can be viewed as systems, with unique objects, inputs, components and outputs, and sketch their own system diagrams to desc... Student groups construct simple conductivity probes and then integrate them into two different circuits to test the probe behavior in solutions of varying conductivity (salt water, sugar water, distilled water, tap water). 5% Discount Code: GREENOPT, Future Tesla Batteries Will Be More Affordable Thanks to Silicon, How Much Renewable Power Americans Actually Use, Ancient Irrigation Systems Could Help Peru on Water Security, Hungary to Build $1 Billion Green-Powered Town From Scratch, 12 Ways to Improve Your Car’s Fuel Efficiency, Floating Bins Cleaning Up Marinas Worldwide, How to Keep Food Cool Without Electricity, How to Build a Free Energy Magnetic Motor, A REAL and WORKING Magnetic Motor Spinning Indefinitely, Hydroelectric Generator: How to Build a Small One, Solar Panel System: How to Build a Cheap One, Do Electric Cars Have Gears? (Grade (middle) If using a multimeter, connect it between the battery and the second electrode. Make electrodes for the free ends of the long pieces of wire by taping the end of the wire to aluminum foil and folding the foil into a rectangle around the wire. Here’s Why. Connect the second electrode to the threaded side of the light bulb. 5. A fun and educational project for all ages! www.teachengineering.org/activities/view/cub_desal_lesson01_activity1, Search curriculum by Common Core standards, Click to view other curriculum aligned to this Performance Expectation, Saltwater Circuit Worksheet (without Multimeter), Saltwater Circuit Worksheet (with Multimeter), Saltwater Circuit Worksheet without Multimeter (docx), Saltwater Circuit Worksheet without Multimeter (pdf), Saltwater Circuit Worksheet with Multimeter (docx), Saltwater Circuit Worksheet with Multimeter (pdf), Build and Test a Conductivity Probe with Arduino, NGSS Engineering-aligned Physics Curriculum, Attend to precision. Activity, Middle School 1. The lamp gives out about 90 lumens equivalent to seven candles lit up or the brightness of a low-LED bulb, she says. Solution A will be much dimmer than Solution B. Data Analysis Rank the solutions from dimmest to brightest by visual observation.