PHYS345 Electricity and Electronics

Hints for 10/5 Assignment

Hint for 6.14

a)   Under what condition does XC short out the lower portion of the voltage divider? When XC is open, what is the result of the voltage divider?

b)   Find the effective impedance of the parallel combination of R2 and C, then use the voltage divider formula to find an expression for the gain.

Hint for 6.18

When there is both inductive and capacitive reactance present, what happens to the voltage divider at resonance? off-resonance?

Hint for 6.20

I find:

H(w) = H0 / (1 - jwc/w), where
H0 = R2/(R1+R2) and
wc(R1+R2)C = 1

Last updated Oct. 8, 1999.
Copyright George Watson, Univ. of Delaware, 1999.