Question

What value of capacitance will have a capacitive reactance of 80 ohms at 796 cycles?

Answer 1

@DanJS

Answer 2

@Luigi0210

Answer 3

@ganeshie8

Answer 4

@sammixboo

Answer 5

What value of capacitance will have a capacitive reactance of 80 ohms at 796 cycles?
If "cycles" is the same thing as frequency, f, "Hertz", Hz ...

reactance = 1/2 pi f C
2 pi f C = 1/reactance
C=1/2 pi f
C = 1/(2*3.142*796)
1.9994e-4 F -> 200 microfarads

Answer 6

theres an error , he didnt devide the reactance right?

Answer 7

I really don't know
It is not from honesty to answer a question I do not know.

Answer 8

reactance=1/2 pi f C, therefore by solving for C... C=1/2 pi f(reactance) .... right? he forgot to plug the reactance which is 80 ohms... watch to his solution.

Answer 9

Right!
So can you solve for C now?

Answer 10

yip

Answer 11

How?

Answer 12

apologies ... Just looking again ...
C = 1/(2*3.142*796)
C = 1/(2*3.142*796*80)
apologies again

Answer 13

No problem, @osprey.
It happens to all of us!

Answer 14

@3mar
i usually put a disclaimer up and use words like "guess", but I've recently been warned for "spamming" or something, so now I'm pretty wary.
Would be "interesting" to see what would happen if a circuit were constructed on the wrong calculation. Either it wouldn't work as intended - designer v annoyed with post, or it would explode, - designer v v annoyed with post ...