Help with understanding this circuit

[Patrick Leonard]

Lets say you have 2 capacitors of equal capacitance wired in series and this
combination wired in series with a resistor, R1. Now, obviously you can
find the equivalent capacitance of the 2 caps and the circuit becomes a
standard RC deal.

But suppose that you place a load between the 2 capacitors. Say a resistor,
R2. Basically, how do you model this circuit?

If the load were an LED, and the values correctly chosen, would it light at
all?

Thanks

 

[Bob Myers]

"Patrick Leonard" <transactoid@rogers.com> wrote in message
news:OdkVa.78046$vz%.68313@news01.bloor.is.net.cable.rogers.com...

Lets say you have 2 capacitors of equal capacitance wired in series and
this
combination wired in series with a resistor, R1. Now, obviously you can
find the equivalent capacitance of the 2 caps and the circuit becomes a
standard RC deal.

But suppose that you place a load between the 2 capacitors. Say a
resistor,
R2. Basically, how do you model this circuit?

From what perspective? If you want to model it just as
a series RC (i.e., what is the equivalent RC seen across the
end nodes), it's the series combination of all these elements -
the total resistance is R1 + R2, and the total capacitance is
1/2 C (where C is the value of each of the two equal caps),
and that's that.

If the load were an LED, and the values correctly chosen, would it light
at
all?

Initially, sure - but if connected to a DC supply, the LED
will turn off just as soon as the capacitors are sufficiently
charged.

Bob M.

 

[Watson A.Name - 'Watt Sun]

In article
<OdkVa.78046$vz%.68313@news01.bloor.is.net.cable.rogers.com>,
transactoid@rogers.com mentioned...

Lets say you have 2 capacitors of equal capacitance wired in series and this
combination wired in series with a resistor, R1. Now, obviously you can
find the equivalent capacitance of the 2 caps and the circuit becomes a
standard RC deal.

But suppose that you place a load between the 2 capacitors. Say a resistor,
R2. Basically, how do you model this circuit?

If the load were an LED, and the values correctly chosen, would it light at
all?

You haven't given enough information to answer the question. Like
which two points is the LED connected? Draw a ssimple diagram for us
using courier font. If the voltage is less than about 2 volts, the
LED will never light, no matter where you connect it.

Thanks

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