Why does this not work

292

07:08:47

If I replace voltage source element with current source it works, but you all know that without voltage there can be no current flow, there is no difference between voltage and current source as both are not mutually exclusive.

So why does this not work, but when I replace it with a current source it does?

published 10 years ago

eightdex

10 years ago

The current source shows the current flow as the capacitor charges, and there is a voltage value written above the capacitor. However, when using the voltage source, it shows the exact point where the capacitor is 99,999% charged and the current flow is insignificant.

sturlan

10 years ago

So connect negative lead of capacitor to gnd

rich11292000

10 years ago

Which one is the negative lead?

darrhunt

10 years ago

Both sides of resistors and lamp are at zero volts.

darrhunt

10 years ago

Put a voltmeter across the current source. Thousands of volts!

ferlop

10 years ago

A lot of confusing information, they are right but the simple answer dikidera is dc current flows thru the capacitor for just a very short time, in other word dc doesn't flow after the capacitor is charged. If you slow down the time, see the clock? turn it counter clockwise to reduce the time and you will see the capacitor charging. I hope this helps.

ferlop

10 years ago

You have to add a switch at the positive terminal of the supply to see the effects.

ferlop

10 years ago

slow the time to 1 us/s

mapplejacks

10 years ago

The current through the capacitor is proportional to the derivative of the voltage across it: I=C*d/dt(V) . So when you put a DC source on it, it quickly comes to equilibrium quickly and current ceases to flow.

dikidera

10 years ago

Thank you guys :)

VatsalModi

10 years ago

Add AC source

RajaBabuSah

10 years ago

This is because "for DC circuit , capacitors work as perfect insulator" . But in the case of AC circuit it as conductor. Initially in both case capacitors work as conductor. But later on when capacitor get fully charged then current flowing through it get stopped in case of DC where as in AC as polarity continuously changing, capacitors never get fully charge as a result it conduct electricity. . For further information refer to Google and search "why capacitors only work on AC circuit not in DC circuit. THANKS

MisterSparkle

10 years ago

Vs : I is calculated, V is fixed, by definition. Is : V is calculated and I is fixed by definition. For Is, the current *must* flow. :-)

sri97

10 years ago

a current source build is complicated. it is made such that the said amount of current MUST flow and it may vary its voltage to acheive this

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