Dynamo Engine Energy Experiment: Charging Phones with Hand Cranked Engine
This experiment focused on using a hand-cranked dynamo engine to charge cell phones, aiming to provide cheap, environmentally friendly energy for developing countries. The group members conducted trials to determine the RPM and energy produced, making assumptions about average cranking capabilities. The procedure involved cranking the engine, counting rotations, and calculating energy generation. Findings indicated the potential for phone charging within a certain time frame based on the energy produced.
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Presentation Transcript
Dynamo Engine By Thomas Landi, Peter Son, Evan Tony
How it Works Utilizing magnetic fields to convert mechanical rotation (via hand crank) into a pulsating direct current. The motion causes the magnetic field to push on electrons through a metal wire creating an electric current.
What We Were Given Dynamo Engine USB Volt Scale Wire to connect scale to engine Wire to plug-in to phone We used one of our phones to complete the circuit.
Mission Statement Mission Statement Product description Dynamo Engine Energy Experiment A hand cranked engine meant for charging cell phones Cheap, environmentally friendly energy for developing countries Help those in developing countries Developing country s citizens Campers needing free energy Mentioned in next slide The Group members and customers Benefit proposition Key business goal Primary Market Secondary Market Assumptions Stakeholders Hypothesis: If someone of average build were to crank a flashlight/radio/dynamo engine for 10 hours, then it would fully charge the phone.
Assumptions and Conditions We ran this experiment under normal indoor conditions. All group members were somewhat well rested and able to turn the dynamo engine with relative ease. The engine we were given was also connected to other devices, such as the flashlight and radio, so it my not have been the most efficient engine for our needs. We assumed that the iPhone 5 battery (.00545 Kilowatt hours) would be a nice average for battery charge The person that will be using the dynamo engine will be in decent enough shape to run this engine at a brisk pace for an extended time period.
Procedure We cranked on the engine for 15 seconds and counted how many revolutions we got. Then we multiplied that number by 4 to get RPM. We had three separate trials and then took our average for our estimated RPM We then looked at the amount of amps we generated in that time and through two calculations found the energy we produced. We then looked at how much energy it took to charge the phone battery we chose and decided how long it would take to charge a phone using our calculations.
Data Three trials : 1st: 37rotations/15sec, 2nd:36r/15sec, 3rd:38r/sec Average amount the average person would be able to crank in a minute: 148RPM During these trials the devices consistent output was 4.60 Volts and 0.35 Amperes
Reflection Although the engine surpassed our expectations the time it would take to charge the phone was still too long. We would want to add bigger engine but have it charged by a person on a bicycle creating more power. Allowing more people to generate the charge would help Also, having an idea of what type of phones is most popular in developing countries would be useful.
Sources Woodford, Chris. "Electricity Generators." Explain That Stuff! Chris Woodford, 21 Apr. 2015. Web. 9 Sept. 2015. <http://www.explainthatstuff.com/generators.html>. Klug, Brian. "Apple Increases IPhone 5C and 5S Battery Sizes Relative to IPhone 5." AnandTech. AnandTech, 12 Sept. 2013. Web. 08 Sept. 2015. <http://www.anandtech.com/show/7324/apple-increases-iphone-5c-and- 5c-battery-sizes-relative-to-5>.
