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Chapter 32: Q. 7 (page 924)
The peak current to and from a capacitor is . What is the peak current if
a. The emf frequency is doubled?
b. The emf peak voltage is doubled (at the original frequency)
Result is:
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Figure Pshows a parallel RC circuit.
a. Use a phasor-diagram analysis to find expressions for the peak currents and .
b. Complete the phasor analysis by finding an expression for the peak emf current I.
A capacitor is connected across an AC generator that produces a peak voltage of . What is the peak current to and from the capacitor if the emf frequency is
(a) ?
(b)?
The telecommunication circuit shown in has a parallel inductor and capacitor in series with a resistor.
a. Use a phasor diagram to show that the peak current through the resistor is
Hint: Start with the inductor phasor .
b. What is in the limits and ?
c. What is the resonance frequency ? What is at this frequency?
You have a resistor and a capacitor of unknown values. First, you charge the capacitor and discharge it through the resistor. By monitoring the capacitor voltage on a oscilloscope, you see that the voltage decays to half its initial value in . You then use the resistor and capacitor to make a low-pass filter. What is the crossover frequency ?
The small transformers that power many consumer products produce a, emf. Design a circuit using resistors and capacitors that uses the transformer voltage as an input and produces a output that leads the input voltage by .
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