Quote:
Originally Posted by Mikeymike77  Hey I am trying to do this formula but I can't work out the last number to get answer the bit I can't do is the 10-6 to get the answer.
frequency of 1 KHZ
2x3.142x1000 x220x10-6 - = 723.4ohms
Frequency 20 KHZ
2x3.142x20000x220x10-9 = 36.2ohms
Can anyone describe how to do the last number? Because on a calculater I don't the same number in ohms ? |
it is
Capacitive Resistance is:
XC =
1
-------------
2*pi*f*C
Where f is Frequency and C is capacitance (farads)
And your answer to question 1 is incorrect decimal in wrong place, Answer = 0.7234 (I bet if you look at calculator 723.4 has a 10-4 to top right of answer.
Question 2. answer correct this is how I got it 100,000,000 / (2 x 3.142 x 20000 x 220) = 36.1715 ohms
The 100,000,000 represent convertion of 1/10-9