When two resistors are connected in siries ,their effective resistance is 80 ohm . when they are connected in parallel ,their effective resistance is 20 ohm . What are the values of the two resistances ?
When two resistors are connected in siries ,their effective resistance is 80 ohm . when they are connected in parallel ,their effective resistance is 20 ohm . What are the values of the two resistances ?
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Answer:
40 , 40
Explanation:
x + y = 80
xy/ x + y = 20
xy = 1600
x(80-x) = 1600
80x - x² = 1600
x² - 80x + 1600 = 0
x = 40 , y = 40