The apprentice Question

[jp1976]

a coil is connected to a 24v AC supply at 50 Hz. if the current supplied to the coil is 360ma and the coil resistance of 35(homes), determine the value of inductance

 

[trev]

Let's have your answer first. We don't do homework but will help if you have a stab at it, remember to put your workings out up.

 

[jp1976]

Let's have your answer first. We don't do homework but will help if you have a stab at it, remember to put your workings out up.

I'm not the apprentice just can't help him with it nor can the other 8 sparks that have seen it. It's been best part of 20 years since I did this stuff

 

[telectrix]

barrat homes or wimpey?

 

[Silly Sausage]

a coil is connected to a 24v AC supply at 50 Hz. if the current supplied to the coil is 360ma and the coil resistance of 35(homes), determine the value of inductance

I'll need to look up the equation to answer that question.
Who can find the answer first?!

 

[telectrix]

X = 2ΠfL, where X is the reactance, f is frequency, L is Henrys ( not the vacuum cleaner, you muppets)

 

[0mega]

Not sure if this question is worded correctly? It's asking for inductance which would be the 35 Ohms already given. Unless it's asking for the value of the coil in Henrys which by transposition would be:

L= 35 / 2 x 3.124 x 50
= 0.11 H

 

[telectrix]

Not sure if this question is worded correctly? It's asking for inductance which would be the 35 Ohms already given. Unless it's asking for the value of the coil in Henrys which by transposition would be:

L= 35 / 2 x 3.124 x 50
= 0.11 H

not sure you have it there. work out the total impedance as X=V/I, then deduct the resistive part of the coil, then from the inductive impedance, work out the value of henrys a per the L=X/2Πf

 

[Tiny Spark]

a coil is connected to a 24v AC supply at 50 Hz. if the current supplied to the coil is 360ma and the coil resistance of 35(homes), determine the value of inductance

As above?

Wimpey or Barrat?

 

[telectrix]

if i'm wrong, someone slap mt arse.

 

[telectrix]

As above?

Wimpey or Barrat?

you're a bit slow, mate. ( post#4)

 

[Silly Sausage]

As above?

Wimpey or Barrat?

People are ignoring your posts again Tel! :smilielol5:

 

[telectrix]

probably using one of them new-fangled posh phones, the ones that ain't got red LED display like ours.

 

[jp1976]

As above?

Wimpey or Barrat?

predictive text for you ohms FFS, ever feel a bit of a tool

 

[Simonslimline]

24V ÷ 0.360A = 66.66666667 Ohms.





66.66666667 - 35 = 31.66666667.





31.66666667 ÷ 2πf = 100mH.



Is this correct?

 

[Silly Sausage]

Don't you mean ...

predictive text for you ohms FFS, ever feel a bit of a fool/QUOTE]

 

[telectrix]

24V ÷ 0.360A = 66.66666667 Ohms.





66.66666667 - 35 = 31.66666667.





31.66666667 ÷ 2πf = 100mH.



Is this correct?

that's exactly what i got.

 

[Silly Sausage]

Are we missing some things squared then rooted here?

 

[1stfix2ndfix]

I'm not the apprentice just can't help him with it nor can the other 8 sparks that have seen it. It's been best part of 20 years since I did this stuff

Top man

 

[0mega]

which is the same 0.11 H

It's already given the value of total inductance as 35 Ohms (close to what you just got above).

So yea I'd say its asking for the rating of the coil in Henrys. The confusion is asking for the inductance which would be the 35 Ohms lol