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March 29, 2024, 02:02:02 am

Author Topic: TrueTears question thread  (Read 67996 times)  Share 

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TrueTears

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Re: TrueTears question thread
« Reply #465 on: November 10, 2009, 10:25:04 pm »
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Gah screw this if this appears on tomorrow's exam just use the total resistance lol.

Logic disappears when you are dealing with electricity.
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naved_s9994

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Re: TrueTears question thread
« Reply #466 on: November 10, 2009, 10:34:27 pm »
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Why not 5.5 for ii and iii?

Me and /0 both got 5.5

The current flows through only 1 wire goes to the transformer then returns to the power supply through the other wire.

Thus the power loss

R should only be 2 and not 4.

DC
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TrueTears

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Re: TrueTears question thread
« Reply #467 on: November 10, 2009, 10:38:17 pm »
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Why not 5.5 for ii and iii?

Me and /0 both got 5.5

The current flows through only 1 wire goes to the transformer then returns to the power supply through the other wire.

Thus the power loss

R should only be 2 and not 4.

DC
????????????????????????????????????????????????????????????????????????

...

I'm sure transformers can function with DC.
PhD @ MIT (Economics).

Interested in asset pricing, econometrics, and social choice theory.

naved_s9994

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Re: TrueTears question thread
« Reply #468 on: November 10, 2009, 10:38:49 pm »
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Why not 5.5 for ii and iii?

Me and /0 both got 5.5

The current flows through only 1 wire goes to the transformer then returns to the power supply through the other wire.

Thus the power loss

R should only be 2 and not 4.














SOrry cant fix this thing  -- but my answer is below




i) The power supplied by the 12V power supply = Voltage of the supply x current through the supply
    I.e 12 x 0.5 = 6W
ii) The power consumed by the primary coil of the transformer = voltage across the coil x current through the coil
   I.e 10 x 0.5 = 5W
iii) The transformer is ideal. Hence same as ii) 5W
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arthurk

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Re: TrueTears question thread
« Reply #469 on: November 10, 2009, 10:46:01 pm »
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my teacher thought only one wire too but when it's like the resistance is 0.05ohms/m you had to calculate the return length as well
i was like rage when i listened to him and got it wrong in prac exam

jules

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Re: TrueTears question thread
« Reply #470 on: November 10, 2009, 11:27:07 pm »
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just a quick question,
if a south end of a magnet enters a coil first, do we say the flux is negative?
(this question may be linked with draw a flux time graph)

Mao

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Re: TrueTears question thread
« Reply #471 on: November 10, 2009, 11:39:03 pm »
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I'm sure transformers can function with DC.

Transformers do NOT function with DC as the primary.

Transformers work of the principle of electromagnetic induction. The change in flux generated by the primary coil (due to alternating current) induces a current in the secondary coil.

Hence when the primary is DC, change in flux is zero, and secondary coil has no current induced.
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TrueTears

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Re: TrueTears question thread
« Reply #472 on: November 10, 2009, 11:39:42 pm »
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I'm sure transformers can function with DC.

Transformers do NOT function with DC as the primary.

Transformers work of the principle of electromagnetic induction. The change in flux generated by the primary coil (due to alternating current) induces a current in the secondary coil.

Hence when the primary is DC, change in flux is zero, and secondary coil has no current induced.
lol I was being sarcastic... =.=
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Mao

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Re: TrueTears question thread
« Reply #473 on: November 10, 2009, 11:41:44 pm »
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I'm sure transformers can function with DC.

Transformers do NOT function with DC as the primary.

Transformers work of the principle of electromagnetic induction. The change in flux generated by the primary coil (due to alternating current) induces a current in the secondary coil.

Hence when the primary is DC, change in flux is zero, and secondary coil has no current induced.
lol I was being sarcastic... =.=

oh oops, didn't follow the thread very closely.

GL for tomorrow :)
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kakar0t

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Re: TrueTears question thread
« Reply #474 on: December 16, 2009, 11:09:16 pm »
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http://i50.tinypic.com/zc1a9.jpg

Question 7. please helpppp

TrueTears

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Re: TrueTears question thread
« Reply #475 on: December 16, 2009, 11:35:59 pm »
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http://i50.tinypic.com/zc1a9.jpg

Question 7. please helpppp
You have to find out the vertical component of the velocity and then use trig to work out the angle. You're given the hypotenuse and you can work out the vertical. So it'd be involving .
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Interested in asset pricing, econometrics, and social choice theory.