11 dp physics_topic 5 electricity & magnetism program.docx

8/17/2019 11 DP Physics_Topic 5 Electricity & Magnetism Program.docx

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Unit Name Topic 5: Electricity and Magnetism Total Number of Lessons 18 (15 teaching hours)

Sub-topic

Topic 5.1: Electric felds Number of Lessons 4

Essential IdeaWhen charges move an electric current is created

Nature o Science !odelling" #lectrical theor$ demonstrates the scienti%c thought involved in the development of a microscopic model

(behaviour of charge carriers) from macroscopic observation The historical development and re%nement of these scienti%c

ideas &hen the microscopic properties &ere un'no&n and unobservable is testament to the deep thin'ing sho&n b$ the

scientists of the time (11)

earning !"#ecti$e

%S&ills' (ontent and )no*ledge+

Teac,ing Met,odology Suggestions

Understandings"

harge#lectric %eldoulomb*s la&#lectric current

+irect current (dc),otential dierence

.pplications and s'ills"

• /dentif$ing t&o forms of charge andthe direction of the forces bet&eenthem

• Solving problems involving electric%elds and oulomb*s la&

• alculating &or' done in an electric

%eld in both 0oules and electronvolts

-tiliation:

• Transferring energ$ from oneplace to another (see Chemistryoption C and Physics topic 11)

• /mpact on the environment fromelectricit$ generation (seePhysics topic 8 and Chemistryoption sub-topic C2)

• The comparison bet&een thetreatment of electric %elds andgravitational %elds (see Physicstopic 10)

/ims:

/im 0: electrical theor$ lies at the

heart of much modern science andengineering


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• /dentif$ing sign and nature of chargecarriers in a metal

• /dentif$ing drift speed of chargecarriers

• Solving problems using the driftspeed euation

• Solving problems involving current2

potential

uidance"Students &ill be e3pected to appl$ oulomb*sla& for a range of permittivit$ values

/im 2: advances in electricaltheor$ have brought immensechange to all societies/im 3: e3periments could include(but are not limited to)"demonstrations sho&ing the eectof an electric %eld (eg usingsemolina)4 simulations involving theplacement of one or more pointcharges and determining theresultant %eld/im : use of computer simulations&ould enable students to measuremicroscopic interactions that aret$picall$ ver$ dicult in a schoollaborator$ situation

esson 1 (,arge' (oulom"6s a* and

Electric 7ield

1 Students vie& pre-made video of chargedistributions and electric force vectors (arro&s

displa$ed on 6ve force sensors) and ma'e

inferences about electric forces

7 Students use ,h#T harges and 8ields sim

to gather

data and create graphs of"

a) electric force v distance (r) bet&een

charges

b) electric force v 19r7

: The$ deduce a value for the oulomb*s La&

constant

esources

!nline simulations:

,h#T harges

and 8ieldshttp"99phetcoloradoedu9sims9charges-and-%elds9charges-and-%elds;enhtml

esson 0 Mapping Electric 7ields

#3periment using a grid taped onto the

bottom of a &ater-%lled plastic bo3 and using a

multimeter functioning as a voltmeter to

measure electric potential at various locations

around dierent-shaped metal electrodes to

map euiptential lines and then infer the

direction of the electric %eld lines

esources:/pparatus:1 cm grid sheet2 plastic bo3 about


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esson 2 (urrent 9 otential

;i and =potential dierence> using ,h#T

sims"

a) ?atter$ @oltage

b) ?atter$-Aesistor icuit

The$ %ll-in the gapps B complete uestions in

the t&o ppt*s"

What is urrent and @oltageC

Do& +oes urrent 8lo&

esourceso*erpoints:What is urrent and @oltageCDo& +oes urrent 8lo&C!nline simulations:,h#T ?atter$ @oltage,h#T ?atter$ Aesistor ircuit

Tas& S,eet:urrent and voltage

esson 4 ro"lems in$ol$ing (urrent'

otential ;i current direction Was this a suitable solution to a ma0or shift in thin'ingC What role do paradigmshifts pla$ in the progression of scienti%c 'no&ledgeC

International Mindedness %eerence to ocal' National and =orld Issues+

#lectricit$ and its bene%ts have an unparalleled po&er to transform societ$

Sub-

topic

Topic 5.0 >eating e


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nature of academia of the time2 &ith ph$sics in Herman$ being largel$ non-mathematical and ?arlo& held in high respect in

#ngland /t indicates the need for the publication and peer revie& of research %ndings in recogniFed scienti%c 0ournals (


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uidance:

• The %lament lamp should bedescribed as a non-ohmic device4a metal &ire at a constanttemperature is an ohmic device

• The use of non-ideal voltmeters iscon%ned to voltmeters &ith a

constant but %nite resistance• The use of non-ideal ammeters is

con%ned to ammeters &ith aconstant but non-Fero resistance

• .pplication of Iirchho*s circuitla&s &ill be limited to circuits &itha ma3imum number of t&osource-carr$ing loops

resistive &ire &ound and taped aroundthe reservoir of a thermometer to relate&ire resistance to current in the &ireand temperature of &ire

/im : there are man$ soft&are andonline options for constructing simpleand comple3 circuits uic'l$ toinvestigate the eect of using dierentcomponents &ithin a circuit

esson 1 (ircuits 9 (ircuit ;iagrams

a) Students vie& ,o&er,oints or teacher

presents them to class

Students ma'e at least TWE dierent series

and parallel circuits The$"

1 +ra& a circuit diagram for each circuit7 /nvestigate the eect of adding e3tra

load elements (bulbs) to each t$pe ofcircuit b$ ta'ing measurements of

current and voltage at strategic

locations

esourceso*erpoints1 Do& do $ou build and dra& anelectrical circuitC7 What dierent t$pes of circuits can$ou haveC: #lectricit$ 1Tas& S,eet:

T$pes of ircuits/pparatus:Lab transformer9recti%er units#lectrical leadsS&itchesLight ?ulbs (identical)@oltmeters and ammeters ormultimeters

esson 0 ? !,m6s a*@ !,mic 9 Non?

!,mic (onductors

In$estigation: ?$ var$ing voltage and

measuring resulting current in each

students create grahs of urrent-@oltge

characteristics of the these components"

1 8ilament lamps (non-ohmic)7 Nichrome &ire in crushed ice-&ater mi3ture

(ohmic): Thermistor4. L+A (light dependent resistor)

esources/pparatus: Transformer9recti%er units2 connecting

&ires2 %lament lamps2 nichrome &ire2thermistors2 L+A*s2 des' lamps2 ice2bea'ers2 small plastic balloons for&ater-proo%ng thermisters


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essons 2 9 4 ? ractice I./.

In$estigating a 7actor T,at /


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divider circuit investigation and complete

+ata .nal$is Wor'sheet O ,otential +ivider

in&s to T,eory o )no*ledge

=Ene aim of the ph$sical sciences has been to give an e3act picture of the material &orld Ene achievement of ph$sics in thet&entieth centur$ has been to prove that this aim is unattainable> O acob ?rono&s'i an scientists ever be trul$ certain oftheir discoveriesC

in&s to t,e earner rofle %InDuirers' )no*ledgea"le' T,in&ers' (ommunicators' rincipled' !pen?minded'

(aring' is&?Ta&ers' alanced' eFecti$e+

The learners &ill use their anal$tical9creative thin'ing s'ills in accomplishing the assessment and activities given to them

Sub-

topic

Topic 5.2 Electric cells Number of Lessons 4

Essential Idea#lectric cells allo& us to store energ$ in a chemical form

Nature o ScienceLong-term ris's" Scientists need to balance the research into electric cells that can store energ$ &ith greater energ$ densit$ toprovide longer device lifetimes &ith the long-term ris's associated &ith the disposal of the chemicals involved &hen batteries

are discarded (


8/12

earning !"#ecti$e

%S&ills' (ontent and )no*ledge+

Teac,ing Met,odology and esources Suggestions

-nderstandings:

ells/nternal resistanceSecondar$ cells Terminal potential dierence

#lectromotive force (emf)

/pplications and s&ills:

• /nvestigating practical electriccells (both primar$ andsecondar$)

• +escribing the dischargecharacteristic of a simple cell(variation of terminal potentialdierence &ith time)

•/dentif$ing the direction of currentGo& reuired to recharge a cell

• +etermining internal resistancee3perimentall$

• Solving problems involving emf2internal resistance and otherelectrical uantities

1

uidance:

7 Students should recogniFe that the

terminal potential dierence of a t$picalpractical electric cell loses its initial valueuic'l$2 has a stable and constant valuefor most of its lifetime2 follo&ed b$ arapid decrease to Fero as the celldischarges completel$

-tiliation:

The chemistr$ of electric cells (seeChemistry sub-topics 9.2 and C.6)

/ims:

/im 3: e3periments could include (butare not limited to)" investigation ofsimple electrol$tic cells using variousmaterials for the cathode2 anode andelectrol$te4 soft&are-basedinvestigations of electrical cell design4comparison of the life e3pectanc$ ofvarious batteries

/im 8: although cell technolog$ can

suppl$ electricit$ &ithout directcontribution from national grid s$stems(and the inherent carbon output issues)2safe disposal of batteries and thechemicals the$ use can introduce landand &ater pollution problems

/im 1G: improvements in celltechnolog$ has been throughcollaboration &ith chemists

esson 1 rimary 9 Secondary (ellsStudents &atch videos on"

(i) #lectrochemistr$

(ii) ells B batteries

esources Boutu"e Aideos:ells B ?atterieshttps"99&&&$outubecom9&atchCvJU/N3hcPLpsc?oFeman Science O #lectrochemistr$https"99&&&$outubecom9&atchCvJAt-@rmQuds

https://www.youtube.com/watch?v=UINxhc8Lpschttps://www.youtube.com/watch?v=UINxhc8Lpschttps://www.youtube.com/watch?v=Rt7-VrmZudshttps://www.youtube.com/watch?v=Rt7-VrmZudshttps://www.youtube.com/watch?v=UINxhc8Lpschttps://www.youtube.com/watch?v=UINxhc8Lpschttps://www.youtube.com/watch?v=Rt7-VrmZudshttps://www.youtube.com/watch?v=Rt7-VrmZuds


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esson 0 ECperiment: Internal

esistance

#3periment to gather data and construct a

graph that can be used to %nd the internal

resistance of a used primar$ cell

esources/pparatus"15@ cell &ith large internal resistance(voltage reads 1@ or less)2 variableresistor (rheostat)2 transformer9recti%erunit2 connecting &ires2 73 multimeters

esson 2 ;isc,arge (,aracteristics o

a Simple (ell

esources:

Boutu"e Aideos:

Lithium /on ells harge .nd +ischarge

haracteristics

https"99&&&$outubecom9&atchCvJ7QtTHvEmd

esson 4 Sol$ing ro"lems In$ol$ing

Electrical ells2 #!8 B /nternal Aesistance

Students complete e3amination st$leproblems involving electrical cells2 emf B

internal resistance

esources: Topic 5 #lectricit$ B !agnetism Student

Wor'boo'


?atter$ storage is seen as useful to societ$ despite the potential environmental issues surrounding their disposal Should

scientists be held morall$ responsible for the long-term conseuences of their inventions and discoveriesC


?atter$ storage is important to societ$ for use in areas such as portable devices2 transportation options and bac'-up po&ersupplies for medical facilities

https://www.youtube.com/watch?v=q2ZtTGvOmd0https://www.youtube.com/watch?v=q2ZtTGvOmd0https://www.youtube.com/watch?v=q2ZtTGvOmd0https://www.youtube.com/watch?v=q2ZtTGvOmd0


10/12

Sub-topic

Topic 5.4 Magnetic e


11/12

forces2 %elds2 current and charges(includes parallel current-carr$ingcnductors)

/ims:

/ims 0 and H: visualiFationsfreuentl$ provide us &ith insightsinto the action of magnetic %elds4ho&ever2 the visualiFationsthemselves have their o&nlimitations

/im : computer-based simulationsenable the visualiFation ofelectromagnetic %elds in three-dimensional space

esson 1 7orce on (,arges Mo$ing in

Magnetic 7ield

Huided simulation investigations using"

1 ohn Travoltage

7 ,h#T harges and 8ields2 and: ,h#T #lectric 8ield Doc'e$

Simulations


12/12

esson 2 7orce et*een arallel

(urrent?(arrying (onductors

#3periment using alfoil strips for current-

carr$ing conductors or &ires and 17 @ batter$

Wor'sheet O ,roblems involving 8orces

.ssociated &ith urrent-arr$ing onductors

esources:/pparatus:Aoll of .lfoil2 scissors2 connecting&ires2 cardboard2 stapler EALong thic' insulated &ires2 retortstands2 bosses and clamps2 17@batter$

esson 4 ? esson on e$ie*ing Topic 5

@arious activities possible"

Students could compete in teams on uiF

format tas's4 the$ could &rite e3amination-

st$le uestions and s&ap &ith peers2 etc

esources:@arious O Who &ants to be a!illionaire pp4 Wor'sheets4 ,astpaper uestions


The investigation of magnetism is one of the oldest studies b$ man and &as used e3tensivel$ b$ vo$agers in the !editerraneanand be$ond thousands of $ears ago


8ield patterns provide a visualiFation of a comple3 phenomenon2 essential to an understanding of this topic Wh$ might it beuseful to regard 'no&ledge in a similar &a$2 using the metaphor of 'no&ledge as a map O a simpli%ed representation of realit$C

11 dp physics_topic 5 electricity & magnetism program.docx

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