z1 = 2 + j2

z2 = 1 + j5

z3 = j6

what is Y when :

Y = (1/z1) + (1/z2) + (1/z3)

1/z3 how is that done??????

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- Jun 12th 2012, 12:44 PMtomjayrectangular and polar forms
z1 = 2 + j2

z2 = 1 + j5

z3 = j6

what is Y when :

Y = (1/z1) + (1/z2) + (1/z3)

1/z3 how is that done?????? - Jun 12th 2012, 03:12 PMBobPRe: rectangular and polar forms
Multiply top and bottom by

- Jun 13th 2012, 12:43 AMtomjayRe: rectangular and polar forms
thanks bobp

is this right what ive done so far

1/z1 = 1/ (2+j2) = 0.25 - j0.25

1/z2 = 1/ (1+j5) = 0.0385 - j0.1923

1/z3 = j6 = j-1/6

add them all together

= 0.2885 - j-0.609 - Jun 13th 2012, 01:44 AMBobPRe: rectangular and polar forms
Not totally correct, though the decimal values are correct.

The end of that last line would be interpreted as minus minus that is, two separate terms. And you have two negative signs when there should just be one.

The correct form should be or I prefer the second one though I know the purists will say that the first is correct.

You make more or less the same mistake in the line immediately above. Write it as it's a multiplication not a subtraction.