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A Pop Quiz
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  • Good morning students! Today we are going to have a pop quiz. You’ll have 15 minutes to read and learn chapter 47.
  • reading and discussing with their friends
  • emm, a moving coil galvanometer detects small currents or small p.d.s, often of the order of milliamps or millivolts.
  • Hey can you ask me questions about this chapter
  • Sure, let's study together! Let's start. Can you explain how a simple moving-coil galvanometer works?
  • correct! Now its time for you to ask me.
  • Yeah that's correct
  • Okay so can you explain to me how a moving-coil galvanometer can be modified for use as an ammeter?.
  • Easy, in order for a galvanometer to be used as an ammeter, it has to have a known low resistance called a shunt 
  • Now my turn to ask you, explain how a moving-coil galvanometer can be modified for use as a voltmeter?
  • emm, oh no i forgot to memorize that part
  • thankyou so much! now it's my turn to ask. explain why an ammeter should have a very low resistance?
  • so the answer is, in order for a galvanometer to be used as a voltmeter it has to have known high resistance which is the opposite to be an ammeter. This known high resistance is called a multiplayer. 
  • wait let me think about it. Oh, Ammeter should have a very low resistance because if it doesn't, it will change the current to be measured!
  • Good job! Good luck with your test!
  • Okay so last question before we run out of time, explain why a voltmeter should have a very high resistance
  • A voltmeter should have a high resistance because if it doesn't, the total resistance of the whole circuit is reduced so changing the current and the p.d (potential difference) measured.
  • You toooo!
  • Time’s up students. Now close your books and clean your table. Only stationeries is allowed on the table. Goodluck and God Bless!
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