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## Series and Parallel Circuit Connections

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**Series and Parallel Circuit Connections**GEMS Seminar 2 April 14, 2005 Presenter: Ana Maria**Topics of Discussion**• Learn Basic Equations • Gather supplies and form groups. • Learn Series and hands on series connections. • Parallel connections and hands on parallel connections. • Applications Presenter Ana Maria Aranda**Basic Equations and their meaning**• Ohms Law V = I*R • Voltage (V); Potential Difference. The drop that occurs once current passes through a resistor or system of resistors. • Current (I); The flow of electrons. Orderly movement of charged particles, creates current. • Resistance (R); Opposes the movement of current, and creates a voltage drop. Presenter Ana Maria Aranda**Closing the path**• In order for current (electrons) to move in a orderly form we must create a path from them. • There are 2 types of paths, series and parallel connections. • You make these paths with wires, or any conducting material. • Pass the secret message activity Presenter Ana Maria Aranda**Conditions for this experiment**Light emitting Diode- Photons • For purpose of this seminar we will model LED (light emitting Diodes) as resistors • We will calculate and assume ideal conditions • We also say that there is a 1.7 V drop with .015Amps • DO NOT Try this Without SUPERVISION!! (A responsible Adult) Resistor Presenter Ana Maria Aranda**Gather Supplies**• Please start counting off. • Have one of your members be a supply person and ask Hanna or Bev for 16 Pieces of tape. • You must have 6 pieces of wire & a 9V battery. • Please don’t play with this until we ask you to! Presenter Ana Maria Aranda**1 type of connection. A Series Connection**• Series connection have the same current, but have different voltage drops. • Its like you are touching the person’s hand next to you only once. • Try it and pretend the desk is the source. The paper is the current so pass it down. Presenter Ana Maria Aranda**Symbols V.S. RealityActivity of Wiring**Presenter Ana Maria Aranda**2nd Type of ConnectionParallel Connection**• Parallel connections share the same voltage across each component. • Its like you are touching the person's hand twice. Try it! Node Node Node Node Node Node Presenter Ana Maria Aranda**Symbols V.S. RealityActivity of Wiring**Presenter Ana Maria Aranda**Experiment Series Connection**• 1st Do a Series connection • Keep in mind Polarity • Try twisting the wires around the LED legs. • Properties: Share the same current Presenter Ana Maria Aranda**Experiment Parallel Connection**• 1st Do a parallel Connection • Keep in mind Polarity • Try twisting the wires around the LED legs. • Properties: Voltage in parallel are the same Presenter Ana Maria Aranda**Applications of LEDs and series connections.**Presenter Ana Maria Aranda**Tying in Logic Gates with Electronic Circuits**• Remember our Logic gates! • What type of connection makes an AND gate? • What type of connection makes an OR gate? http://www.technologystudent.com/elec1/dig2.htm Presenter Ana Maria Aranda**Tying in Logic Gates with Electronic Circuits**• What type of connection makes an AND gate? • Its like a series connection requiring both connections to be closed in order to turn on the light • What type of connection makes an OR gate? • Its like a parallel connection requiring only one path (one connection) Presenter Ana Maria Aranda • http://www.technologystudent.com/elec1/dig2.htm**A little bit about a battery.**• A battery has a positive (Anode) and negative (cathode) terminal and once you connect a load there is a path you create having the charged particles flow from (-) to (+) exact opposite of current flow. http://electronics.howstuffworks.com/battery.htm Presenter Ana Maria Aranda**How does a LED get its color?**• Inside a LED there is a semiconductor chip that has a bad gap. • A electron will try to jump from one plate to another, when they do this they emit a photon, with a wavelength of a certain length. • Red lights come from a short distance between the material. • Yellow light comes from a larger band gap. Presenter Ana Maria Aranda**So where is the math? Series Connection.**• We can calculate the series and Parallel resistance, voltage, current given at least 2 of the conditions. • Looking at the Series, we know that they share the same current, but there is a voltage has to be divided into each component. • To find the voltage, sum up all the resistors and multiply by the total current. Presenter Ana Maria Aranda**So where is the math? Parallel Connection.**• Looking at the Parallel connection. They share the same voltage, but the current had to be shared and divided at each node. • To find the Voltage now. Sum up all the resistors. • Resistors in parallel summation rule • Use V = I*Req Presenter Ana Maria Aranda**Extended activity**• Team up with another group and find out how many LED’s in series can you connect before they can’t light up any more. • Try it for the parallel Connection! Presenter Ana Maria Aranda**Pick up time!**• Please organize your material. • Throw away the tape in the trash • At the ends of the table place the LEDs by color. And Stack the Batteries as well! • THANKS!!! Presenter Ana Maria Aranda**Next TIME!**• Next week we will be doing applications using Squick. • Please finish the survey if you have not finished it. • Please be reminded that we have feedback forms on our website for this workshop. • Till NEXT TIME 4:00 April 14th same place! Presenter Ana Maria Aranda