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E4 Introducing Electricity

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E4 Introducing Electricity

  1. 1. E4 : Introducing Electricity
  2. 2. What are the sources of electricity? <ul><li>Mains Electricity </li></ul><ul><li>Electric cells </li></ul>
  3. 3. How does Electricity flow in an Electric circuit? <ul><li>Conventional current :- + to - </li></ul><ul><li>Electric flow :- - to + </li></ul><ul><li>-------------------------------------------------------- </li></ul><ul><li>Electric current – The flow of electric </li></ul><ul><li>charges. </li></ul><ul><li>Electric circuit – The path which the </li></ul><ul><li>electric current take. </li></ul>
  4. 4. What are Conductors and Insulators of Electricity ? <ul><li>Electric Conductor – A material that allow </li></ul><ul><li>electricity to pass through it. </li></ul><ul><li>Electric Insulator – A material that does not </li></ul><ul><li>allow electricity to pass </li></ul><ul><li>through it. </li></ul>
  5. 5. Series circuit
  6. 6. Pros and Cons about the way the circuit is arranged. <ul><li>Brighter </li></ul><ul><li>If one bulb fuses the rest of the circuit will still work. </li></ul><ul><li>Last longer </li></ul><ul><li>Not brighter </li></ul><ul><li>If one bulb fuses the whole circuit will not work. </li></ul><ul><li>Lasts short </li></ul>Parallel circuit Series circuit
  7. 7. Does an Electric Current always flow easily in a circuit? <ul><li>No, components of a circuit are said to have resistance. </li></ul><ul><li>Resistance – The force put up against the flow of electrons. </li></ul><ul><li>Resistance – SI : ohm </li></ul>
  8. 8. What are Resistors? <ul><li>Resistors are used when we want to change the size of the current in a circuit. </li></ul><ul><li>Fixed resistor – </li></ul><ul><li>Variable resistor – </li></ul><ul><li>- Variable resistors can be use to control the amount of resistance. </li></ul>
  9. 9. Voltmeter <ul><li>Voltage is the difference in potential energy between two points; Potential Difference. </li></ul><ul><li>In other words, the amount of energy converted to other forms of energy. </li></ul><ul><li>A Voltmeter can measure this Potential Difference . </li></ul><ul><li>A Voltmeter is put parallel in a circuit. </li></ul>Voltmeter SI :
  10. 10. Ammeter <ul><li>A light Bulb can tell us if an electric current is flowing in a circuit. </li></ul><ul><li>But it cannot tell us the size of the electric current , for that we need an Ammeter. </li></ul><ul><li>1 A = 1000 mA </li></ul><ul><li>1 mA = 0.001 A </li></ul>SI : <ul><li>A Ammeter is put in series in a circuit. </li></ul>
  11. 11. Variable resistor
  12. 12. What effects does an Electric Current Have? <ul><li>Heating – e.g. kettle – The heat is produced by the resistance in the wire. </li></ul><ul><li>Magnetic – e.g. electromagnet – The coils in the wire . </li></ul><ul><li>Chemical – e.g. electrolysis – Copper chloride decomposes into copper and chlorine gas when electricity passes through it. </li></ul><ul><li>– Electroplating – It is when a metallic object covered with a thin layer of another metal. </li></ul>

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