A Pop Quiz
Kuvakäsikirjoitus Teksti
- 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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