According to its design specification, the timer circuit delaying the closing of

Question

According to its design specification, the timer circuit delaying the closing of an elevator door is to have a capacitance of 27.0 mu F between two points A and B. When one circuit is being constructed, the inexpensive but durable capacitor installed between these two points is found to have capacitance 29.4 mu F. To meet the specification, one additional capacitor can be placed between the two points. Should it be in series or in parallel with the 29.mu F capacitor? What should be its capacitance? Mu F The next circuit comes down the assembly line with capacitance 26.1 mu F between A and B. To meet the specification, what additional capacitor should be installed in series or in parallel in that circuit? magnitude mu F orientation

Explanation / Answer

a)in series 1/27=1/29.4+1/capacitance b)capacitance=27*29.4/(29.4-27)=330.75 c=27-26.1=0.9

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