|Oct3-10, 12:54 AM||#1|
find current at high/low frequency
1. The problem statement, all variables and given/known data
find the rms current delievered by the 45v (rms) power supply when
a) the frequency is very large
and b) the frequency is very small.
answer: a) 225mA, b) 450mA
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2. Relevant equations
w= angular velocity (supposed to be omega)
j= complex coefficent = sqrt(-1)
Zl= resistance of inductor
Zc= resistance of capacitor
Ztot= total resistance
R= resistance of resistor
Ztot= R + Zl + Zc = R + j(Xl-Xc)
3. The attempt at a solution
with frequency just being high, how am I supposed to get these exact numbers without letters/symbol for I? o.o I tried the calculation and omega did not cancel out either.
|Oct3-10, 02:24 AM||#2|
The key idea is that in the case of very high or very low frequency, you can take the impedance (resistance) of the inductor and capacitor to be ~infinite, respectively. Does it make sense why that's true (as an approximation at least)?
In effect, this eliminates one of the two loops in the circuit for each case.
|Oct4-10, 02:19 PM||#3|
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