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A resistor is connected across an acsource as shown. For this circuit, whatis the relationship between theinstantaneous current i through theresistor and the instantaneous voltagevab across the resistor?
Q31.1
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
A resistor is connected across an acsource as shown. For this circuit, whatis the relationship between theinstantaneous current i through theresistor and the instantaneous voltagevab across the resistor?
A31.1
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
An inductor is connected across an acsource as shown. For this circuit, whatis the relationship between theinstantaneous current i through theinductor and the instantaneous voltagevab across the inductor?
Q31.2
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
An inductor is connected across an acsource as shown. For this circuit, whatis the relationship between theinstantaneous current i through theinductor and the instantaneous voltagevab across the inductor?
A31.2
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
A capacitor is connected across an acsource as shown. For this circuit, whatis the relationship between theinstantaneous current i through thecapacitor and the instantaneous voltagevab across the capacitor?
Q31.3
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
A capacitor is connected across an acsource as shown. For this circuit, whatis the relationship between theinstantaneous current i through thecapacitor and the instantaneous voltagevab across the capacitor?
A31.3
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
An L-R-C series circuit as shown isoperating at its resonant frequency.At this frequency, how are the valuesof the capacitive reactance XC, theinductive reactance XL, and theresistance R related to each other?
Q31.4
A. XL = R; XC can have any value.
B. XC = R; XL can have any value.
C. XC = XL; R can have any value.
D. XC = XL = R.
E. none of the above
An L-R-C series circuit as shown isoperating at its resonant frequency.At this frequency, how are the valuesof the capacitive reactance XC, theinductive reactance XL, and theresistance R related to each other?
A31.4
A. XL = R; XC can have any value.
B. XC = R; XL can have any value.
C. XC = XL; R can have any value.
D. XC = XL = R.
E. none of the above
In an L-R-C series circuit as shown,the current has a very smallamplitude if the ac source oscillatesat a very high frequency. Whichcircuit element causes thisbehavior?
Q31.5
A. the resistor R
B. the inductor L
C. the capacitor C
D. misleading question — the current actually has a verylarge amplitude if the frequency is very high
In an L-R-C series circuit as shown,the current has a very smallamplitude if the ac source oscillatesat a very high frequency. Whichcircuit element causes thisbehavior?
A31.5
A. the resistor R
B. the inductor L
C. the capacitor C
D. misleading question — the current actually has a verylarge amplitude if the frequency is very high
In an L-R-C series circuit as shown,there is a phase angle between theinstantaneous current through thecircuit and the instantaneous voltagevad across the entire circuit. For whatvalue of the phase angle is thegreatest power delivered to theresistor?
Q31.6
A. zero B. 90°
C. 180° D. 270°
E. none of the above
In an L-R-C series circuit as shown,there is a phase angle between theinstantaneous current through thecircuit and the instantaneous voltagevad across the entire circuit. For whatvalue of the phase angle is thegreatest power delivered to theresistor?
A31.6
A. zero B. 90°
C. 180° D. 270°
E. none of the above
In an L-R-C series circuit as shown,suppose that the angular frequencyof the ac source equals theresonance angular frequency. Inthis case, the circuit impedance
Q31.7
A. is maximum.
B. is minimum, but not zero.
C. is zero.
D. is neither a maximum nor a minimum.
E. not enough information give to decide
In an L-R-C series circuit as shown,suppose that the angular frequencyof the ac source equals theresonance angular frequency. Inthis case, the circuit impedance
A31.7
A. is maximum.
B. is minimum, but not zero.
C. is zero.
D. is neither a maximum nor a minimum.
E. not enough information give to decide
In the transformershown in the drawing,there are more turns inthe secondary than inthe primary. In thissituation, the voltageamplitude is
Q31.8
A. greater in the primary than in the secondary.
B. smaller in the primary than in the secondary.
C. the same in the primary and in the secondary.
D. not enough information given to decide
In the transformershown in the drawing,there are more turns inthe secondary than inthe primary. In thissituation, the voltageamplitude is
A31.8
A. greater in the primary than in the secondary.
B. smaller in the primary than in the secondary.
C. the same in the primary and in the secondary.
D. not enough information given to decide
Q31.9
In the transformershown in the drawing,there are more turns inthe secondary than inthe primary. In thissituation, the currentamplitude is
A. greater in the primary than in the secondary.
B. smaller in the primary than in the secondary.
C. the same in the primary and in the secondary.
D. not enough information given to decide
In the transformershown in the drawing,there are more turns inthe secondary than inthe primary. In thissituation, the currentamplitude is
A31.9
A. greater in the primary than in the secondary.
B. smaller in the primary than in the secondary.
C. the same in the primary and in the secondary.
D. not enough information given to decide
