Does your body use electricity at Does your body use electricity at all? Is it similar to a circuit?all? Is it similar to a circuit?

-Explain your answer-Explain your answerYes, electrical signals travel along nerves Yes, electrical signals travel along nerves

carrying information to and from your BRAIN. carrying information to and from your BRAIN. Heart uses electrical impulses to move bloodHeart uses electrical impulses to move blood

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____Electric fieldElectric field

__Electric force__Electric force

__Electric current__Electric current

__Electric circuit__Electric circuit

a.a. How electric charges are How electric charges are drawn towards or pushed drawn towards or pushed awayaway

b.b. The continuous flow of The continuous flow of electric charges through electric charges through materialmaterial

c.c. A complete unbroken A complete unbroken path through which path through which electric charges can flowelectric charges can flow

d.d. Region around a charged Region around a charged object (proton, electron) object (proton, electron) where electric force is where electric force is exertedexerted

• OPEN YOUR BOOK to page 36. Neatly, OPEN YOUR BOOK to page 36. Neatly, recreate diagram A, B, and C recreate diagram A, B, and C (write the verbal (write the verbal explanation and pay attention to vector explanation and pay attention to vector arrows)arrows)

http://phet.colorado.edu/en/simulation/electric-hockey

• Why can we not use lightning as a source of Why can we not use lightning as a source of current electricity?current electricity?

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• We can not control the flow of electrons. All We can not control the flow of electrons. All the energy is released immediately. the energy is released immediately.

• What three components do you need to have a What three components do you need to have a complete circuit? complete circuit? Give three examples of eachGive three examples of each

1. 1. Power SourcePower Source (push/force volts) battery, (push/force volts) battery, generator, solar cellgenerator, solar cell

2. 2. ConductorConductor (transfers electrons)-wires, nerves, (transfers electrons)-wires, nerves, metalsmetals

3. 3. Resistor/LoadResistor/Load (uses the electricity)- refrigerator, (uses the electricity)- refrigerator, fan, lights, dryer, etc.fan, lights, dryer, etc.

• Why do conductors allow ELECTRONS to move Why do conductors allow ELECTRONS to move throughout more easily than insulators?throughout more easily than insulators?

a.a. The atoms that make them up have tightly bound The atoms that make them up have tightly bound electrons.electrons.

b.b. The atoms that make them up have more The atoms that make them up have more electronselectrons

c.c. The atoms that make them up have loosely The atoms that make them up have loosely bound electronsbound electrons

d.d. The atoms that make them up have less electronsThe atoms that make them up have less electrons

• The third prong of an appliance is connected to ?The third prong of an appliance is connected to ?

a.a. The line coming from the electric plantThe line coming from the electric plantb.b. The ground wireThe ground wirec.c. The line going to the electric plantThe line going to the electric plantd.d. A circuit breaker or fuseA circuit breaker or fuse

- Appliances need to be grounded so that charges are - Appliances need to be grounded so that charges are able to flow directly from the circuit into Earth in the able to flow directly from the circuit into Earth in the event of a short circuit or power surgeevent of a short circuit or power surge

• Using your notes for Ohm’s Law. What Using your notes for Ohm’s Law. What happens to the current if you??????? happens to the current if you???????

• Increase VoltageIncrease Voltage• Increase ResistanceIncrease Resistance Current will Current will

______________• Decrease VoltageDecrease Voltage• Decrease ResistanceDecrease Resistance

6 Craziest Extinctions

https://www.youtube.com/watch?v=wissIOikrqc

• In a series circuit, the more light bulbs that are In a series circuit, the more light bulbs that are added, the bulbs become?added, the bulbs become?

a.a. DimmerDimmerb.b. HotterHotterc.c. BrighterBrighterd.d. More ResistantMore Resistant

For a given voltage being pushed, more RESISTORS For a given voltage being pushed, more RESISTORS decrease the flow of the electric currentdecrease the flow of the electric current

• What TWO factors will determine your What TWO factors will determine your households energy bill each month?households energy bill each month?

A.A.Power and Volts usedPower and Volts usedB.B. Power and Amps usedPower and Amps usedC.C. Power and TimePower and TimeD.D.Power and ResistancePower and Resistance

--So turn off the lights, shut the fridge, shut the So turn off the lights, shut the fridge, shut the door, unplug appliances not being used, door, unplug appliances not being used, You’ll You’ll pay one daypay one day

• If your household’s electric meter was at If your household’s electric meter was at 2,982 kWh on February 12 and 3,292 kWh on 2,982 kWh on February 12 and 3,292 kWh on March 12. How much was the energy bill for March 12. How much was the energy bill for that month?that month?

Assume energy cost is about $.85 cents per Assume energy cost is about $.85 cents per kWh.kWh.

$263.50 for that month$263.50 for that month

• A microwave has a power rating of 1000 W A microwave has a power rating of 1000 W and uses the standard voltage in your and uses the standard voltage in your household (120 V). What is the current household (120 V). What is the current through the microwave?through the microwave?

Current ___________________Current ___________________

• What do power companies What do power companies use to transfer electricity use to transfer electricity over long distances via over long distances via power lines?power lines?

a.a. ConvertersConvertersb.b. CapacitorsCapacitorsc.c. TranscodersTranscodersd.d. TransformersTransformers

http://www.youtube.com/watch?v=tUO3o5JTGhQhttp://www.youtube.com/watch?v=tUO3o5JTGhQ

• Looking at Looking at your diagram of step-up/step-your diagram of step-up/step-down down transformerstransformers

• When the voltage is decreased by a step-When the voltage is decreased by a step-down transformer, is energy (POWER) down transformer, is energy (POWER) destroyed in the process?destroyed in the process?

• No, even though the voltage decreases, the No, even though the voltage decreases, the current will increasecurrent will increase

• POWER = VOLTAGE X CURRENTPOWER = VOLTAGE X CURRENT

• Make a list of technology or items that use an electromagnet to operate.

• Does your cell phone have a strong enough Does your cell phone have a strong enough electromagnet (magnetic field) to scramble a hotel key electromagnet (magnetic field) to scramble a hotel key card? Explain……card? Explain……

• MOST likelyMOST likely, it is either a weak magnetized code , it is either a weak magnetized code caused by the repeated use of being programmed, OR caused by the repeated use of being programmed, OR faulty reader scanning code to begin with.faulty reader scanning code to begin with.

• Although highly unlikely it is still possibly plausibleAlthough highly unlikely it is still possibly plausible

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1.1. Get out you Electromagnet Lab InvestigationGet out you Electromagnet Lab Investigation2.2. Look at your dataLook at your data3.3. In your composition book discuss the following In your composition book discuss the following

promptsprompts– What factors either strengthened or weakened your What factors either strengthened or weakened your

electromagnet?electromagnet?– Of the items tested what did they have in Of the items tested what did they have in

common….why magnetic attraction?common….why magnetic attraction?– What do you know now that you didn’t get before What do you know now that you didn’t get before

investigating?investigating?

• Note Book Check?Note Book Check?1.1. What is the question to the bell work on Feb. 11, What is the question to the bell work on Feb. 11,

2013 2013 2.2. Write the ANSWER to the bell work on 1/7/13Write the ANSWER to the bell work on 1/7/133. For the “Star Cycle” what stage was the star in 3. For the “Star Cycle” what stage was the star in

for No. 3for No. 34. Write out learning target J4. Write out learning target J5. Write out learning target R5. Write out learning target R

• The brake light on an automobile is connected to The brake light on an automobile is connected to a 12-volt battery. If the resulting current is 0.40 a 12-volt battery. If the resulting current is 0.40 amps, what is the resistance of the amps, what is the resistance of the brake?.........remember OHM’s LAW……………brake?.........remember OHM’s LAW……………

• SHOW YOUR WORKSHOW YOUR WORK

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• List types of technology, in the medical field, List types of technology, in the medical field, used to examine the anatomy of a patient?used to examine the anatomy of a patient?

• Do you know what type of energy it uses?Do you know what type of energy it uses?

• Explain how the following demonstration Explain how the following demonstration would represent a power plant and electricity would represent a power plant and electricity being generatedbeing generated

• To produce an electric current, charges must To produce an electric current, charges must flow continuously from one place to another. flow continuously from one place to another. Which of the following provides an unbroken Which of the following provides an unbroken path for charges to flow?path for charges to flow?

a.a. A series circuitA series circuitb.b.A parallel circuitA parallel circuitc.c. A complex circuitA complex circuitd.d.All of the aboveAll of the above

• YOUR QUIZYOUR QUIZ1.1. Write every learning target since the Write every learning target since the

beginning of the yearbeginning of the year2.2. Explain how or why you understand the Explain how or why you understand the

learning target (USE COMPLETE SENTENCES)learning target (USE COMPLETE SENTENCES)3.3. Diagram each circuit and explain the flow of Diagram each circuit and explain the flow of

electrons (series, complex, parallel)electrons (series, complex, parallel)APRIL FOOLS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!APRIL FOOLS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!