HELP HELP!! some question related to my homework pls help~ - Electronic Circuits Projects Diagrams Free

anzdyy · 29th February 2008, 05:06 PM

2)The coil of a 300V moving iron voltmeter has a resistance of 500Ω and an
inductance of 0.8H. The instrument reads correctly at 50 Hz AC supply and
takes 100-mA at full scale deflection. What is the percentage error in the
instrument reading when it is connected to 200VDC supply?

3)A 250V moving-iron voltmeter takes a current of 0.1A when it is
connected to a 250VDC supply. The coil has an inductance of 0.5H. Determine
the error in the reading when the meter is connected to a 250V, 50Hz AC supply,
assuming that the voltmeter reads correctly at DC supply.

hi.. i am new member i don know is it correct to post it here if is wrong pls tell me.. thx alot... ok.. up there is the questions.. i ady have the solution i will upload it pls kindly try to see for me... y this two is almost the similiar question but question 2 is using V,voltage to find while question 3 is using I, current to find.. thx for the help...

blueroomelectronics · 29th February 2008, 05:10 PM

If we do your homework for you what will you learn?

anzdyy · 29th February 2008, 05:11 PM

zzz juz a simple question la even the solution i d got juz don understand wan to ask pls

blueroomelectronics · 29th February 2008, 05:16 PM

Quote:

Originally Posted by anzdyy

zzz juz a simple question la even the solution i d got juz don understand wan to ask pls

Sorry I don't understand baby talk?

anzdyy · 29th February 2008, 05:17 PM

i mean i already have the solution juz have some doubt so post it up to ask~

blueroomelectronics · 29th February 2008, 05:19 PM

Then tell us your answers, that might start a discussion.

anzdyy · 29th February 2008, 05:20 PM

i d attach on it.. the image inside got solution for question 2 and 3~ see nicely,... thanks

Gaston · 29th February 2008, 09:01 PM

where is nigel? usually he would put a stop to that kind of jargon. haven't seen any replies from him in a while.

mneary · 29th February 2008, 10:47 PM

Your images are 2500 x 3500 pixels. You'll have to wait till someone gets a high enough resolution screen so they will fit.

Pommie · 1st March 2008, 02:57 AM

I only checked your first answer and it looks fine to me. The only error I can see is you can't separate the reactance into w²L², it has to be (wL)². You state the equation wrong but have done the calculations correctly.

Mike.

anzdyy · 1st March 2008, 03:05 AM

Quote:

Originally Posted by Pommie

I only checked your first answer and it looks fine to me. The only error I can see is you can't separate the reactance into w²L², it has to be (wL)². You state the equation wrong but have done the calculations correctly.

Mike.

but my doubt is y the first question is using V,voltage to calculate the error while in question 2 is in I, current, ampere to calculate the error. thanks for the help..

Pommie · 1st March 2008, 03:30 AM

Quote:

Originally Posted by anzdyy

but my doubt is y the first question is using V,voltage to calculate the error while in question 2 is in I, current, ampere to calculate the error. thanks for the help..

You can calculate it either way. Try redoing the first question but work out the currents involved and you will get the same error value. BTW, your second question looks correct as well.

Mike.

anzdyy · 1st March 2008, 06:35 AM

Quote:

Originally Posted by Pommie

You can calculate it either way. Try redoing the first question but work out the currents involved and you will get the same error value. BTW, your second question looks correct as well.

Mike.

oh ya y i din think of this.. thanks.. will try do myself

anzdyy · 2nd March 2008, 12:59 PM

Quote:

Originally Posted by anzdyy

oh ya y i din think of this.. thanks.. will try do myself

i tried but cant.. how how teach me

anzdyy · 2nd March 2008, 01:00 PM

Quote:

Originally Posted by Pommie

You can calculate it either way. Try redoing the first question but work out the currents involved and you will get the same error value. BTW, your second question looks correct as well.

Mike.

i tried but i cant get it how how?? teach me

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29th February 2008, 05:10 PM	(permalink)
blueroomelectronics	If we do your homework for you what will you learn? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

29th February 2008, 05:11 PM	(permalink)
anzdyy	zzz juz a simple question la even the solution i d got juz don understand wan to ask pls

29th February 2008, 05:17 PM	(permalink)
anzdyy	i mean i already have the solution juz have some doubt so post it up to ask~

29th February 2008, 05:19 PM	(permalink)
blueroomelectronics	Then tell us your answers, that might start a discussion. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

29th February 2008, 05:20 PM	(permalink)
anzdyy	i d attach on it.. the image inside got solution for question 2 and 3~ see nicely,... thanks

29th February 2008, 09:01 PM	(permalink)
Gaston	where is nigel? usually he would put a stop to that kind of jargon. haven't seen any replies from him in a while.

29th February 2008, 10:47 PM	(permalink)
mneary	Your images are 2500 x 3500 pixels. You'll have to wait till someone gets a high enough resolution screen so they will fit.

1st March 2008, 02:57 AM	(permalink)
Pommie	I only checked your first answer and it looks fine to me. The only error I can see is you can't separate the reactance into w²L², it has to be (wL)². You state the equation wrong but have done the calculations correctly. Mike.