Unit 5 – Electricity, Magnetism and Waves

Physical Science 2013-14Semester 2

4/15/14

• Entry Task

• Describe everything you know about electricity, magnetism and waves.

• Please turn in your reflections TOMORROW for the Unit 4 Test.

• HW Read pages 382-388, answer # 1-8 on page 388. Due Friday 4/18/14

Today’s Agenda

• Notes on Electricity• Video on Electricity

4/15/14

• Exit Task

• Describe charges and how you could create an attraction between two objects based on charges.

• What charges would repel each other?

4/16/14

• Entry Task

• Define electric current, electric circuit and voltage.

Today’s Agenda

• Notes on Electricity• Please staple your MIT movie notes to these

notes and turn them in.• Phet simulations + Worksheet• You will be working with the person seated next

to you. PLEASE WRITE BOTH NAMES ON THE WORKSHEET.

• Decide who will be recorder for page 1 and page 2.

Electricity

• A neat analogy to help understand these terms is a system of plumbing pipes. The

voltage is equivalent to the water pressure, the current is equivalent to the flow rate, and the resistance is like the

pipe size.• http://science.howstuffworks.com/environmental/437-green-gadgets-the-kill-a-watt-video.htm

• whether two charges attract or repel depends on whether they have the same or opposite sign

• unit of measurement for charge is the coulomb (C)– one electron has a charge of

0.00000000000000000016 coulombs

Charge

Current• comes from the motion of electrons• is the rate at which electrons flow past a point

on a circuit– measured in units called amperes, or amps (A)

current

Voltage• a measure of electric potential energy• voltage is an electrical force

– measured in volts (V)• a difference in voltage provides the energy that

causes current to flow

Resistance• the resistance to the flow of electrical current

– measured in ohms• the resistance of electricity creates heat

Circuits• current only flows when there is a complete

and unbroken path, or a closed circuit

Electricity and Circuits (8:35)http://www.youtube.com/watch?

v=D2monVkCkX4&feature=related

• series circuit– current can only take one path, so the

current is the same at all points in the circuit

• parallel circuit– the current can take more than one path– each branch works independently

4/16/14

• Exit Task

• Explain the analogy of a water system and electrical circuit using the words: voltage, current and resistance.

4/17/14• Entry Task

• Watch last portion of video. • Finish notes. • Explain the difference between a series circuit and a parallel circuit.

• REMINDER: HW Read pages 382-388, answer # 1-8 on page 388. Due Friday 4/18/14

•

Today’s Agenda

• Remaining slides of notes• Faraday’s Work• Phet simulations + Worksheet• You will be working with the person seated

next to you. PLEASE WRITE BOTH NAMES ON THE WORKSHEET.

• Decide who will be recorder for page 1 and page 2.

4/17/14

• Exit Task

• How did you prove today in PHET that electric current flowing in a wire creates a magnetic field around the wire? (HINT: what happened to the compass?)

• IF YOU HAVE NOT, turn in your movie/notes papers…

4/18/14

• Entry Task

• Say Something Nice

• Trade and Grade HW from page 388 #1-8. Please turn this in.

Today’s Agenda

• Read pages 388-394, 398 and answer #1-5 on page 400

• Read pages 418-421, 425, 427 and answer #1-4 on page 429

• Read pages 432 and 434 and answer #1-4 on page 435.

4/18/14

• Exit Task

• Trade and Grade your entry/exit task sheets.• Graders please sign the top.• Turn these in.

4/21/14• Entry Task• In your own words, explain how atoms give rise to

magnetic properties in metal. (Hint: look at page 428)

• Homework: Read pages 388-394, 398 and answer #1-5 on page 400

• Read pages 418-421, 425, 427 and answer #1-4 on page 429

• Read pages 432 and 434 and answer #1-4 on page 435. Due Wednesday

Today’s Agenda

• Finish the PHET worksheet with partners. • Review answers. • Turn in worksheets• Extra Time? Work on HOMEWORK!

4/21/14

• Exit Task

• Which portion of the simulations showed the electromagnetic effect?

• “electric current flowing in a wire will create a magnetic field around the wire (electromagnetic effect).”

4/22/14

• Entry Task

• Watch Ms. Maring demonstrate a generator. Read page 434. Explain how the generator works.

• Review yesterday’s EXIT task…• HAPPY EARTH DAY! We’ll be dim as much as

possible….

Today’s Agenda

• Complete the PHET simulations work and worksheet.

• Review answers – turn in worksheet.• Finished early? Go to “Physics” then

“Electricity, magnets and circuits” then “Generator”

• Play with the generator simulation. How can you generate the MOST electricity?

4/22/14• Exit Task

• Review answers on PHET. Talk with your neighboring team: share answers!

• REMINDER: Homework: Read pages 388-394, 398 and answer #1-5 on page 400

• Read pages 418-421, 425, 427 and answer #1-4 on page 429

• Read pages 432 and 434 and answer #1-4 on page 435. Due Wednesday

4/23/14

• Entry Task

• Describe the energy transfers and transformations in the hand crank flashlight.

• Trade and Grade HW. • How does a compass tell direction?• Review QUICKLY phet and turn in…

4/23/14

• NO EXIT TASKS – hold onto your sheets until NEXT FRIDAY.

4/28/14Week of 4/28 to 5/2/14

• Entry Task- you may use last week’s sheet…

• Watch the magnet powered pinwheel demonstration. Describe the energy transfers and transformations in the system.

• Finish review of last page of PHET packet. TURN THESE IN if you have not

Today’s Agenda

• Complete introduction reading. • Explain to other half of class what you will be building

and how it works.• You will complete one of two different labs.

– Build a generator and answer questions. – Build a magnet powered pinwheel and answer questions.

• BE VERY CAREFUL WITH MATERIALS!• As a team, answer all the questions in your packet. • ALLOW 5 FULL minutes of clean-up before EXIT TASK to

return all materials to their original condition. All materials will be counted.

4/28/14

• Exit Task

• How did your lab demonstrate either the generator effect or the electromagnetic effect?

• Explain using the vocabulary: – electric current and flow of electrons, – magnet and magnetic field, – wire coil and light bulb OR battery and wire.

4/29/14

• Entry Task

• Describe what you know about the electromagnetic spectrum. List all the types EM waves you can think of.

• Homework: Read pages 632-637. Answer #1-5, 9-11 on page 637. Read pages 606-619. Answer #1-4, 9 on page 619. Due FRIDAY.

• Talk through yesterday’s EXIT TASK.

Today’s Agenda

• As a group, complete the packet questions from yesterday’s lab.

• PUT EVERY GROUP MEMBER’S NAME ON TOP and turn the packet in.

• Begin EM Spectrum Packet• Tomorrow we will work with spectrometers.• Finished early? Work on homework!

4/29/14

• Exit Task

• Which EM wave has the highest energy and frequency? The lowest?

4/30/14

• Entry Task

• Read page 636. Explain technological/social uses for each type of EM wave.

• MISSING 3 rolls of electrical tape between 2 and 4th periods yesterday. PLEASE TURN IN…no questions ask. Or, let me know if you saw something.

• AC vs DC? Look here!

Today’s Agenda

• GAMMA RAYS and nuclear decay…• Otherwise nuclear decay is particles…• Begin EM Spectrum Packet• Use your book and the internet to seek answers.

Log on early and work on something else while you wait…computers are slow to load!

• Tomorrow we will work with spectrometers.• Finished early? Work on homework!

4/30/14

• Exit Task

• Write down the EM spectrum waves in order from lowest energy to highest energy.

5/1/14

• Entry Task

• What is a wave’s period and what is its frequency? Use a swing as an example to help you explain. (Hint look at page 607).

Today’s Agenda

• Draw spectra with color pencils for each kind of light on the back of EM Spectrum sheet.

• Discuss answers – turn sheet in.

5/1/14

• Exit Task

5/2/14

• Entry Task

• Say Something Nice

• Trade and Grade Homework!

Today’s Agenda

• Start Slinky Lab• Write Pre-Lab info in Comp books

5/2/14

• Exit Task

• Trade and Grade Entry/Exit Task Sheets• Please turn these in.

• Have a great weekend