RC circuits simulation

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7 Οκτ 2013 (πριν από 4 χρόνια και 7 μέρες)

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A
P Physics


Unit 12

RC Circuits

r
021312


Access Simulation 20.4,
“Charging the Capacitor” by googling “Wiley RC circuit simulation”.

http://higheredbcs.wiley.com/legacy/college/halliday/04
71758019/simulations/sim35/sim35.html



A

resistor and capacitor are connected in series to a 10 volt battery. Two

graphs are shown: o
ne displays

the capacitor volta
ge

as a function of
time
, and the other

the current in the circuit as a function of time
. (T
his
is the current through the resistor.
)


Note:

press
ing

the Charge
-
Discharge button

resets the time readout
.


Use the simulation to answer the following questions:

1.

What is the maximum possible value of the capacitor voltage?



2.

What is the maximum

possible value of the current in the circuit?



3.

What is the relationship


direct, inverse, or none


between

a.

resistance and the time it takes to fully charge the capacitor?



b.

capacitance and the time it takes to fully charge the capacitor?



4.

How is the
i
nitial

current in the circuit affected by

each of

these two variables?




5.

If it takes a time

T

for the capacitor voltage
to reach 2 volts, how much more time does it
take to reach
4 volts
--

equal
to
, less tha
n, or more than
T
?


Is the relationship linear

or
non
-
linear
?




6.

In this simulation the battery voltage is 10 volts. When the capacitor voltage is 6 volts,
what is the voltage across the resistor? Does Kirchhoff's loop rule apply to this circuit?




7.

In DC circuits that involve only resistors and batte
ries, the current does not change with
time. By adding a capacitor, as we have done here, the current does change with time
.
Why doe
s this

make sense in terms of what you understand capacitors do
?