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A circuit is so formed such that the source-R-C-diode-switch are in series. Consider the initial voltage across the C to be zero. The diode is so connected that it is forward biased when the switch is closed. When the switch is closed,

(a) the current will decay exponentially & the voltage will increase exponentially

(b) the current will increase exponentially & the voltage will increase exponentially

(c) the current will fall to zero & the voltage both will decay exponentially

(d) the voltage and current both remain constant

This question was posed to me by my school principal while I was bunking the class.

My query is from Diode Circuits-1 topic in chapter Diode Circuits of Power Electronics

1 Answer

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by (45.1k points)
Correct answer is (a) the current will decay exponentially & the voltage will increase exponentially

The best I can explain: Instant switch is closed, the current is maximum Vs/R than starts to reduce, whereas voltage starts to increase from 0 to Vs (Capacitor Charging).

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