 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 40- W 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?  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