Section 1 & 2 - Electrical Principles & Technologies

Section 1:

Definitions:

  • Charge separation
  • Electrical discharge
  • Electrical current
  • Circuit
  • Electrical energy
  • Ampere
  • Short Circuit
  • Electrochemical cell
  • Electrolyte
  • Electrolysis

Knowledge:

\  \n 1. What charge does an electron have? A negative one (-) \n 2. What charge does a proton have?Apositiveone(+)A positive one (+) \n 3. How does a balloon stick to the wall?Byaddingelectronstothesurfaceoftheballoon,hewallbecomesmorepositivelychargedthantheballoonBy adding electrons to the surface of the balloon, he wall becomes more positively charged than the balloon

 Balloon Sticking To Wall

 \n 4. The Laws of Electrical Charges:Oppositechargesattract,likechargesrepelOpposite charges attract, like charges repel \n 5. What is the difference between a conductor and an insulator?(Conductor)materialthatelectricchargecanmovethrougheasily,(Insulator)Substancethatstronglyresiststheflowofelectricity(Conductor) material that electric charge can move through easily, (Insulator) Substance that strongly resists the flow of electricity \n 6. What are some examples of conductors and insulators?(Conductors)Water,metals−(Insulators)Rubber,paper(Conductors) Water, metals - (Insulators) Rubber, paper \n 7. What is the relationship between voltage, a volt, and a voltmeter?Voltage=howmuchelectricalenergyachargedparticlecarries,Avoltistheunitusedtomeasurethis,Avoltmetermeasurestheelectricalenergyachargedparticlecarries(throughvolts)Voltage = how much electrical energy a charged particle carries, A volt is the unit used to measure this, A voltmeter measures the electrical energy a charged particle carries (through volts) \n 8. What are the minimum three things you need in order to complete a circuit? \n 9. Electrical safety practices?Fuses,CircuitBreakers(andthirdpronginplug)Fuses, Circuit Breakers (and third prong in plug) \n 10. How fuses and circuit breakers work?Fuses=thinpieceofmetalthatmeltswhenthecurrentistoohigh,CircuitBreakers=HaveaspringtripmechanismthatstopstheflowofcurrentFuses = thin piece of metal that melts when the current is too high, Circuit Breakers = Have a spring trip mechanism that stops the flow of current \n 11. How lightning rods work?They make it so that the strike lands on the insulated rod & balanced out the number of electrons which come from the strike. \n 12. What is the difference between a dry cell and a wet cell?DryCell=Acellthathasitselectrolyteintheformofapaste,WetCell=AnelectrochemicalprimarycellhavingaliquidelectrolyteDry Cell = A cell that has its electrolyte in the form of a paste, Wet Cell = An electrochemical primary cell having a liquid electrolyte \n 13. How does a rechargeable battery work?Itproduceselectricitythroughachemicalreaction.Thisreactioncanbereversedusinganexternalsourcetorunelectricitybackthroughthecell.It produces electricity through a chemical reaction. This reaction can be reversed using an external source to run electricity back through the cell.

14. What is the difference between a primary cell and a secondary cell? PrimaryCell=cellthatproduceselectricitybymeansofachemicalreactionthatcannotbereversed,SecondaryCell=rechargeableCellPrimary Cell = cell that produces electricity by means of a chemical reaction that cannot be reversed, Secondary Cell = rechargeable Cell \n 15. What is electroplating?Theuseofelectricitytocoatathinlayerofmetalontoanobject.The use of electricity to coat a thin layer of metal onto an object.

Section 2:

Definitions:

  • Resistance
  • Ohm’s Law
  • Ohm’s Calculations
  • Voltmeters
  • Ammeters
  • Schematic
  • Series Circuit
  • Parallel Circuit
  • Transistors
  • Microcircuits

Knowledge:

 \n 1. What happens to electrons in an insulator?TheyareresistedThey are resisted \n 2. What happens to electrons in a conductor?TheycaneasilypassthroughThey can easily pass through \n 3. The difference between a resistor and a variable resistor?Resistor=devicehavingresistancetothepassageofelectricalcurrent,VariableResistor=resistorwhoseresistancecanbechangedResistor = device having resistance to the passage of electrical current, Variable Resistor = resistor whose resistance can be changed \n 4. Examples of resistors and variable resistors we might have at home \n 5. How is a waterfall used as a model of electricity? What are the rocks? What about the \n elevation? What do they represent? \n 6. Making calculations using Ohm’s law \n 7. What does a multimeter measure? \n 8. How do you draw a schematic diagram? \n 9. Proper symbols for schematic diagrams \n 10. What happens to the resistance if you add more loads to a series circuit? \n 11. What happens to the resistance if you add more loads to a parallel circuit? \n 12. How do combination circuits work in a house?

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