The apprentice Question

[Simonslimline]

Are we missing some things squared then rooted here?

Like in one of the examples in this link?


3 Ways to Measure Inductance - wikiHow

 

[telectrix]

no, it says the resistance is 35ohms ( or wimpeys)

 

[0mega]

Are we missing some things squared then rooted here?

If it wanted Impedence Z = square root of R2 + X2

But thats if there was a resistor in the circuit as well as an inducter

I may be wrong its just I'm going through this stuff atm so it's all fresh in my head lol

 

[telectrix]

a coil has both resistance and inductance. do'ntr need an additional resistor, unless for current limiting..

 

[Silly Sausage]

If it wanted Impedence Z = square root of R2 + X2

But thats if there was a resistor in the circuit as well as an inducter

I may be wrong its just I'm going through this stuff atm so it's all fresh in my head lol

I suspect the OP means the Impedance (Z) is 35 Ohms. (and purely reactive)

 

[telectrix]

must be a superconductor. zero ohms resistance.

 

[telectrix]

if the impedance was 35ohms, current would be 24/35 = 0.6857A. but it's not. ot's 0.360A

 

[Simonslimline]

Are we missing some things squared then rooted here?

What do you make it Archy?

150mH ?

 

[Silly Sausage]

What do you make it Archy?

150mH ?

I need some fresh air, I'm off to the shop for more beer to clear my mind!

 

[Tiny Spark]

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

Thats why it said as above

Comeon get with the program tel

 

[Silly Sausage]

0.18 Henrys

 

[telectrix]

0.18 Henrys

let's see your working out for that.

edit: i don't mean at the gym.

 

[Silly Sausage]

Humph!

IFF R is 35
from the OP, Z = 66.6666667

X = (66.67[SUP]2[/SUP] - 35[SUP]2[/SUP])[SUP]1/2[/SUP]

X = 56.74

so L is 56.74/(2*Pi*50) = 0.18

 

[Simonslimline]

0.18 Henrys

Edit...

 

[Charlie_]

I take it the apprentice is at a basic level, if
so the answer is just simply 100mH

 

[Silly Sausage]

so L is 56.74/(2*Pi*50) = 0.18

Correct or nonsense?
Comments?

 

[Charlie_]

The coil resistance is 35 ohms.
Do a quick sketch of an RL circuit.
Make your observations of voltage and current.
Now transpose your observations to a vector diagram.
Does this help?
I would make a crap lecturer haha

 

[GEOFF S]

cheers

 

[telectrix]

Correct or nonsense?
Comments?

can't see where you get the squares and the 1/2 from

 

[Silly Sausage]

can't see where you get the squares and the 1/2 from

Z[SUP]2[/SUP] = R[SUP]2[/SUP] + X[SUP]2[/SUP]

so

Z = sqrt(R[SUP]2[/SUP] + X[SUP]2[/SUP]) or (R[SUP]2 [/SUP]+ X[SUP]2[/SUP])[SUP]1/2[/SUP]​


the 1/2 is the exponent for square root.