Tuesday 12 January 2016

Series capacitor equivalence



I have capacitors of 100uF, 10uF and 1uF; and need a series circuit with these capacitors to form a 0.1uF capacitor, is this possible?



Answer




Series association


This association gives a lower total capacity than any of its component capacitors. The total capacity, for \$n\$ capacitors is


$$ C_{eq} = \dfrac{1}{\sum\limits_{n}\dfrac{1}{C_n}} $$


Parallel association


This association gives a greater total capacity than any of its component capacitors. The total capacity, for \$n\$ capacitors is


$$ C_{eq} = \sum\limits_nC_n $$


So, for your question, the answer is yes. You must connect 10 capacitors of 1\$\mu\$F in series.



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