Why Can't Voltage Change Instantly in a Capacitor or Current in an Inductor?

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#1 21671356 21 Apr 2014 05:25

Bhuvanesh Nick Bhuvanesh Nick

Anonymous

Post #1
21671356 21 Apr 2014 05:25

Voltage and why voltage cannot change instantaneously in capacitor but current but why current cannot change instantaneously in inductor. Thank you in advance.
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#2 21671357 21 Apr 2014 09:17

DAVID CUTHBERT DAVID CUTHBERT

Anonymous

Post #2
21671357 21 Apr 2014 09:17

Two formulas illustrate this.

The formula i = C dV/dt says that the current thru a capacitor is equal to capacitance multiplied by dV/dt. To change voltage instantaneously (infinite dV/dt) the current must be infinite.

To formula V = L di/dt says that the voltage across an inductor is equal to inductance multiplied by di/dt. To change current instantaneously (infinite di/dt) the voltage must be infinite.
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#3 21671358 21 Apr 2014 19:43

Bhuvanesh Nick Bhuvanesh Nick

Anonymous

Post #3
21671358 21 Apr 2014 19:43

bq). To change voltage instantaneously (infinite dV/dt) the current must be infinite.

i am weak in math.to change voltage instantaneously why the current should be infinite.please give detail explanation.thank you in advance
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#4 21671359 23 Apr 2014 03:25

Cameron M Cameron M

Anonymous

Post #4
21671359 23 Apr 2014 03:25

changing the current or voltage instantaneously means (dt=0approximately) i.e the slop (dv/dt or di/dt) goes to infility . then i(for the c) or v(for the inductor) should be infinite.
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#5 21671360 23 Apr 2014 03:58

Jed Darryl Anayron Jed Darryl Anayron

Anonymous

Post #5
21671360 23 Apr 2014 03:58

dv/dt is the change of the voltage with respect to time. Remember that capacitors are open when applied with a DC voltage. A DC voltage has dv/dt = 0, which means that there is no change in its voltage. Applying it in the equation i = C dV/dt, current would be zero. The contrary applies to inductors. Please check on the capacitor/inductor graphs for more info.
#6 21671361 23 Apr 2014 07:38

DAVID CUTHBERT DAVID CUTHBERT

Anonymous

Post #6
21671361 23 Apr 2014 07:38

Electronics is all about math. So, you might want to hit the books and learn some more math.
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Why Can't Voltage Change Instantly in a Capacitor or Current in an Inductor?

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