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LO: Use a physical model to describe the flow of electric charges in series and parallel circuits. SC: Develop a physical model for electric current and potential energy Use this physical model to trace the flow of electric charges in series and parallel circuits. DO NOW: Write LO and SC on new left side page WDYS/WDYT-pg. 606 Investigate Part A: vocabulary with pretzels Students assemble like picture on page 607. Teacher = switch 1 student = battery 1 student – light bulb Rest = charges (only charged when student has pretzel in their hand) Round 1 Battery=energy supply=joules=pretzels Light bulb=dancing student Electric charges=coulomb=students Round 2: Battery=energy supply=joules=pretzels “I am one VOLT, which means, I am one joule (pretzel) of energy to each coulomb (student)” “Please move along, one coulumb (student) per second is one amp of current” Light bulb=dancing student “I just received one joule (pretzel) of energy from that coulomb (student) Electric charges=coulomb=students “I just gained one joule of energy from the battery” “I just gave one joule of energy to the light bulb” Round 3 Battery is 3 Volts Gives each coulomb 3 joules of energy Round 4 Battery is 1 Volt Current is 2 amps=2 coulombs per second #9 page 608: a, b, c, d, e, f LO: Use a physical model to describe the flow of electric charges in series and parallel circuits. SC: Develop a physical model for electric current and potential energy Use this physical model to trace the flow of electric charges in series and parallel circuits. DO NOW: Describe the difference between a joule and a volt. Agenda Investigate Part B: vocabulary with pretzels Series circuit 2 light bulbs, each must get some energy Battery is 1 Volt Charges have to spread their joule (pretzel) to each light bulb equally #2 a #3 a, b, c, d 1V battery = 1 J of energy (pretzel) for each coulomb (student) of charge Charges flowed at the rate of 1 amp (or 1 coulomb per second=1 student per second) The # of Joules (pretzels) per second that a bulb receives determines how BRIGHT the bulb is Joules per second=Power (measured in Watts) 1 Watt=1 Joule/sec Which will be brighter? A 100-W bulb or a 40W bulb? Why? #4a: copy table at top page 609 Potential energy Electric potential energy Battery Resistor Coulomb Current Voltage Volt Joule Ampere Series circuit Watt LO: Use a physical model to describe the flow of electric charges in series and parallel circuits. SC: Develop a physical model for electric current and potential energy Use this physical model to trace the flow of electric charges in series and parallel circuits. DO NOW: Find the joules per second for a 3 volt battery, with a 5 amp current. Investigate Part A: vocabulary with pretzels Volume Actions Questions? Finished with the slide? Students are quiet and headphones are off Notebooks are out and pencils are recording information from the board Students must raise their hand to ask or answer questions. Please wait patiently without talking or distracting your neighbor How is your bloodstream similar to an electric current? Like blood cells, electrons carry energy to the light bulb. The energy is used up (pretzel/joule), but the electron is not (student) What is electrical potential energy? Energy that has not yet been used up and is being held by an electron or battery What is a resistor? An object in an electrical circuit that consumes energy. This object will often determine how quickly the electrons can pass by (current) An explanation of the electron shuffle What is a series circuit? An electrical circuit where there is only one path for the electrons to follow The electrons move with the same current throughout the entire circuit How do we represent a series circuit? What determines the brightness of a light bulb? VA W R The number of Watts, or Joules per second. You can use the following equation for a series circuit (thank you Ayo and Arthur) W = Power V= Volts A= current (amperes) R = resistors, or number of light bulbs What does it mean? How do you know? Why should you care? Expectations Stay in your seat Speak at a whisper with your neighbor Record Answers in notebook Potential energy Electric potential energy Battery Resistor Coulomb Current Voltage Volt Joule Ampere Series circuit Watt Expectations Stay in your seat Speak at a whisper with your neighbor Record Answers in notebook