Grade9NaturalSciences

Term3:Energyandchange

Cells

2.1SourceCellsareasourceofelectricalenergy.

Cells

2.2Chemicalreac1onsSchema=crepresenta=on:

Chemicalpoten=alenergy(ionsbeforetheyareseparated).

Kine=c(movement)energyofcharges(electricalenergy)

Grade9NaturalSciences

Term3:Energyandchange

Seriescircuitsandparallelcircuits

3.1Conductorsandresistors3.1.1Conductors

Component Symbol PhotoConnector

Defini>on

Seriescircuitsandparallelcircuits

Connectors:•substancesthatconductanelectricalcurrent;•offerliCleresistanceagainstflowofcharge;•metalslikecopper,silver,iron.

Seriescircuitsandparallelcircuits

Poten>alenergy

Kine>cenergy

Electricalenergy

Inappliances

LED

Cars

Rheostat

Lightbulbs3.1.2Resistors

Defini>on

Seriescircuitsandparallelcircuits

Resistor:•hasahighresistanceagainsttheflowofcurrent;

•isthecomponentinacircuitthatcancontroltheenergytransferinthecurrentandconvertitintousefulforms;

•isaweakconductorofelectricity.

Seriescircuitsandparallelcircuits

Circuitcomponents:

Component Symbol PhotoResistorLightbulb

Seriescircuitsandparallelcircuits

3.1.3Factorsthatinfluenceresistance•Type•Length•Thickness•Temperature

Page226inGrade9NaturalSciencesTextbookandWorkbook

Aim: Tocreateacell/ba<eryusinglemons.

Results: Thelightbulbglows.

Conclusions: LEDthatburnsorthereadingonasensi6vemeter,isanindica6onthatanelectricalcurrentflowed.