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Resistivity Q (AS)

Can someone explain why you multiply by 6?



Reply 1
Avatar for Mo2351
Mo2351
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Original post by Patrick2810
Can someone explain why you multiply by 6?





You would have to multiply the length by 6 as the iron wire has been looped around the piece of paper. This means that if you were to stretch it all out It would be 6 times as long as the gauge length .

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Original post by Mo2351
You would have to multiply the length by 6 as the iron wire has been looped around the piece of paper. This means that if you were to stretch it all out It would be 6 times as long as the gauge length .

Posted from TSR Mobile


How do you know it is looped ?
Reply 3
Avatar for Mo2351
Mo2351
3
Original post by Patrick2810
How do you know it is looped ?


You just have to use the diagram. On the thin sheet of paper follow the the lines and you'll see that there are six lengths of it.

Posted from TSR Mobile
Original post by Mo2351
You just have to use the diagram. On the thin sheet of paper follow the the lines and you'll see that there are six lengths of it.

Posted from TSR Mobile


thanks :smile: would rep but can't !
Reply 5
Avatar for Mo2351
Mo2351
3
Original post by Patrick2810
thanks :smile: would rep but can't !


No worries mate

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Original post by Patrick2810
Can someone explain why you multiply by 6?





Oh my God. I did this exact past paper yesterday. Its January 2010 Edexcel right?

You use the equation R=P.L/A to get the resistance but times it by 6 because you have to count the wires in there which are 6 lengths.

Shocked I did this past paper yesterday and you asked a question on it today :tongue:
The spreadsheet questions at the end of the paper are a bit annoying but the paper does have low grade boundaries :smile:

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