Electricity 1 primary pupils


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electricity, primary science

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Electricity 1 primary pupils

  1. 1. Electricity
  2. 2. CONDUCTORSAre MATERIALS that allow chargesThat allow charge to easily FLOWMost common Metals Graphite
  3. 3. INSULATORS This makes them VERY POOR In INSULATORS electrons are they can move BUT cannot flow ANCHORED to the atoms conductors.. Glass Wood Plastic Rubber
  4. 4. Switches are used to open or close an There are many different electric circuit types:Push-to-breakPush-to-make Interrupter
  5. 5. Current ElectricityThe switch a batteryclosedCharges current to flow By using must be cell Before theybe PUSHED For a must canWhen the switch stops The current is opened
  6. 6. Current Intensity - + A AIsThepass each point in the It is Currentof the series acoulomb ammeter of Using an is measured connected in flow Thatmeasureevery second compound unit is replaced It 1 the number IntensityIn thisoften thesecond science Asis The Every ampere or amp Although CONVENTION from CURRENT FLOWSflow is case BYCurrent of coulombs electrons in case FROM chargeaaroundword by single a circuit circuit = 1 amp + - + -Unit: coulombs/second c/s A amps
  7. 7. Current IntensityThe current depends on the voltage The brighter the light bulb The bigger current voltage 1 cell 2 cells 1 amp = 2 amp = 1coulomb/sec 2coulomb/sec A A
  8. 8. The cell (or battery) Which helps to push charge around Provides the voltage the circuit And Toreactthe aare These acquirecell Thisacquire negative ToThe voltaic more Thecauses with the the less reactive electrodes + Immersed in an acid Two electrodes + -- DIFFERENTcharge positive metal reactive metals metal consists of charge acid + -- + + - The build up of charge Electrical potential Between the This DIFFERENCE in E.M.F or (voltage) A is also called the + - + - electrodes results in energyCathode Anode
  9. 9. The cell The common alkaline cellDepends on the materials usedThe voltage produced by a cell is made of for the electrodes Manganese Oxide Cathode This combination Results in an Of about 1.5 V Alkaline E.P.D. (Voltage) of electrodes electrolyte Zinc Anode
  10. 10. The batteryIsAs combinationseries a the word in of cells Connected suggests, Connectedflatseries The3 x 1.5 V cells Is 4.5 V in pack
  11. 11. Electrical Potential DifferenceVoltmeters are connected in parallel Is measured using a voltmeter 6V V V Circuit symbol 6V Cell V 6V
  12. 12. Resistanceas is thepass through a the flow of it they opposition to conductingALL CONDUCTORS have resistance material chargesThe electrons collide with vibrating and the conductor gets hot and this generates heat atoms as they move
  13. 13. Resistance Depends on The dimensions of the conductor Short Thick Long Thin smaller biggerconductor resistance
  14. 14. Resistance Depends on The conductor material Nichrome Iron Has moreresistance than Copper Iron
  15. 15. Resistancechange HIGH resistance material Use you want a conductor to If a electrical energy into heat Nichrome or Tungsten
  16. 16. Resistancechange electrical energymaterialIf Use a LOW resistance into heat you DON’T want a conductor to Aluminium or Copper
  17. 17. Light Bulbs have highchange They resistancesElectrical Heat Light Energy Energy Energy
  18. 18. Connecting light bulbs: IN SERIES The resistance in the circuitEach time a light bulb is connected The lightlightcurrent flows All If a light bulb blows off A the bulbs grow dimmer smaller bulbs turn INCREASES in SERIES A 0.33amp 0.5amp 1 amp
  19. 19. E.P.D. in series circuitsThe sum of the E.P.D across each The EMF of the cell Equals component Cell EMF= 6V V V V 2V 2V 3V 6V 2V 3V
  20. 20. Connecting light bulbs: IN PARALLELThe current taken each lightbatteryEachbrightness ofbulbin the bulb is The time a light from each light current flowing is connected If a light bulb blows bulbincreases inis unchanged unchanged PARALLEL A 3 2 1 amp 1amp 1amp 1amp
  21. 21. E.P.D. in parallel circuitsEach timeThe EPD of theisit The component cell a e.m.f. across connected equals emf = 6V 6V 6V 6V V V V