2 Outline of Presentation Progression of learningG10 Electricity and Magnetism learning competenciesG10 Electricity and Magnetism goals and objectivesLearning activitiesSample activityDiscussion of resultsApplication of concepts derived from the activitiesDEPARTMENT OF EDUCATION
3 Electricity and Magnetism Electric ChargeElectric ForceElectric FieldElectric PotentialElectric Current (I)ElectrostaticsMagnetic Field and CurrentElectrical PowerElectrical energyElectric circuit/connectionOhm’s LawGr. 7Electric chargesAttraction/Repulsion between chargesFlow of charges (Simple electric circuit)Gr. 8Electric current (I, V, R relationship)Electrical connections (connections at home)
4 World of Electricity and Magnetism Electric ChargeElectric ForceElectric FieldElectric PotentialElectric Current (I)ElectrostaticsMagnetic Field and CurrentElectrical PowerElectrical energyElectric circuit/connectionOhm’s LawEM InductionMagnetic Field (B)MagnetismB due to IForce of B on IElectromagnetsMotorsFaraday’s LawGenerator/TransformerPower TransmissionMagnetic FieldMagnetic forces
5 Power Generation, Transmission, and Distribution Grade 9Power Generation, Transmission, and DistributionSource:Where does electricity come from? How is it produced? How does it get to our home?
6 Grade 10 Electromagnetic Induction What happens inside the generator? How does it “produce electricity”?Source:
7 Grade 10 Electric Motor Applications of EM Waves (including Light) How else is electrical energy changed into other forms of energy that are useful to us?Source:
8 G10 Force, Motion, and Energy Electricty and Magnetism Learning CompetenciesDemonstrate the generation of electricity by movement of a magnet through the coilExplain the operation of a simple electric motor and generatorWhich then brings us to these learning competencies found in our science curriculum guide (Grade 10). But before the learners achieve these competencies, they have to go through more specific objectivesDEPARTMENT OF EDUCATION
9 G10 Force, Motion, and Energy Electricty and Magnetism Goals/ObjectivesUnderstand the nature of magnet/magnetic fieldMagnetic domainsExploring magnetic fielda. around permanent magnets of different shapes;b. between like and unlike poles;c. around a straight current-carrying conductor;d. around a current-carrying loop of wire; ande. around the Earth.DEPARTMENT OF EDUCATION
10 G10 Force, Motion, and Energy Electricty and Magnetism Goals/ObjectivesUnderstand the relationship between electricity (electric current) and magnetism (magnetic field) and use this relationship in explaining principles behind generators, motors and other devices (recording devices)Investigate what happens whena current carrying conductor is placed within a magnetic fielda conductor is moved within a magnetic fieldDEPARTMENT OF EDUCATION
11 The Floating Paper Clip Getting hooked ...The Floating Paper Clip
12 DEPARTMENT OF EDUCATION Learning ActivitiesMagnetismActivity 1 For the Record…Getting familiar with the various equipment commonly found inside a radio broadcasting studioActivity 2 Test Mag...1, 2!Observing interactions between magnets and between a magnet and ‘non-magnet’Activity 3 Inducing MagnetismInducing magnetism in a magnetic materialActivity 4/5 Detecting Magnetism/Oh, Magnets…Determining direction of magnetic field around a permanent magnet using magnetic compass/magnetic field createrDEPARTMENT OF EDUCATION
13 DEPARTMENT OF EDUCATION Learning ActivitiesElectricity and MagnetismActivity 6 Electric Field SimulationActivity 7 Magnetic Field SimulationComparing electric and magnetic field lines using PhET Interactive Simulations ProjectDEPARTMENT OF EDUCATION
14 Learning Activities Magnetism from Electricity Activity Magnetic Field around Current-Carrying ConductorsActivity Making your Own Electric MotorElectricity from MagnetismActivity Let’s Jump InGenerating electricity with the aid of the Earth’s BActivity Principles of Electromagnetic InductionInvestigating factors affecting the strength and direction of B
16 Activity 8: Magnetic Field around Current-Carrying Conductors ObjectivesUsing a compass, explore the magnetic field around current-carrying conductors.Use the magnetic compass to determine the direction of a magnetic fieldA. around a straight current-carrying conductor; andB. at the center of the current-carrying coil.
17 Part A: Magnetic Field around a Straight Conductor * SetupconductorsupplySource:Materials neededStraight current- carrying conductor setup*Power supply/Dry cellsConnecting wiresMagnetic compassCardboard/Illustration board
18 Part B: Magnetic Field at the Center of a Coil Materials neededCurrent-carrying coil setup*Power supply/Dry cellsConnecting wiresMagnetic compassCardboard/Illustration board* SetupSource:
19 Part A without current with current Conductor Top View out of the paperConductorMagneticcompassinto the paperwith currentXwithout current
20 Part B + - - without current + with current Side View Clockwise Counterclockwise-without current+with current
22 Hans Christian Oersted The story behind...In 1819, Hans Christian Oersted, a Danish physicist and chemist and a professor in the University of Copenhagen, discovered during a class demonstration that a current carrying wire would deflect the compass needle. He inferred that an electric current would induce a magnetic field.Hans Christian Oersted(1777–1851)
23 Guide QuestionsPart AFrom a top-view perspective, in which direction does the north pole of the compass needle point when placed around the straight current-carrying conductor? If the direction of the current is reversed, in which direction does the needle point?
24 Part B: Magnetic Field at the Center of a Coil +-
25 Visualizing Magnetic Field Iron FillingsMagnetic Compass
26 Direction of Magnetic Field Right Hand Rule (RHR)If a current carrying conductor is imagined to be held in the right hand such that the thumb points in the direction of the current, then the tips of the fingers encircling the conductor will give the direction of the magnetic lines (magnetic field)CurrentMagneticField
27 Force on a current-carrying conductor in a magnetic field What happens when a current -carrying conductor is placed within a magnetic field?EM Swing
28 Force on a current-carrying conductor in a magnetic field The direction of the force on a current carrying conductor in a magnetic field can be determined by using the right hand rule (RHR)IBF
29 Working Principle of Electric Motor Application:Working Principle of Electric MotorElectric Motor
30 DEPARTMENT OF EDUCATION Concept CheckA current carrying wire is perpendicular to the card as shown in the figure below.Which of the arrows in the figure shows the direction of the magnetic field at point Y ?ABCDY+-DEPARTMENT OF EDUCATION
31 DEPARTMENT OF EDUCATION BCDConcept CheckA wire conductor is placed between the poles of a strong permanent U magnet as shown in the figure below. The direction of current I through the wire is also shown. Which arrow indicates the direction of the force on the wire?IBADEPARTMENT OF EDUCATION
32 DEPARTMENT OF EDUCATION BCDConcept CheckA rectangular loop of wire OPQR carrying a current is in a uniform magnetic field as shown in the figure below. What is the direction of the force on PQ?to the rightto the leftvertically upwardsvertically downwardsDEPARTMENT OF EDUCATION
33 Concepts Learned Magnetic Field An electric current produces magnetic effect around the conductor (called Magnetic Field)The magnetic field surrounding a current-carrying conductor can be shown by sprinkling iron filings or arranging magnetic compasses around the conductorThe compasses line up with the magnetic field (a pattern of concentric circles about the wire) produced by the current.When the current reverses direction, the compasses turn around, showing that the direction of the magnetic field changes also.
34 Concepts Learned Motor Effect A current-carrying conductor when placed in a magnetic field experiences a force.If the direction of the field and that of the current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both. This is the basis of an electric motor.The direction of the magnetic field, current and force can be determined using the RHR.
35 Inquiry in Practice Process Skills Engaging in scientific-oriented questionsGathering evidenceProviding explanations based on evidenceCommunicating explanationsProcess SkillsObservingInferencePredictingExperimentingCommunicating explanations