Physics Alternating Current Level: High School
An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz . Determine the peak voltage of the generator .a. 180 V
b. 255 V
c. 300 V
d. 360 V
e. 480 V
Physics Alternating Current Level: High School
When the frequency of an ac circuit is increased at constant voltage the current increases and then decreases . Which combination of elements is most likely to comprise this circuit ?a. Resistors only.
b. Inductors only.
c. Capacitors only.
d. A combination of inductors and resistors.
e. A combination of inductors and capacitors.
Physics Alternating Current Level: High School
An ac voltage source that has a frequency f is connected across the ends of an inductor . Which one of the following statements correctly indicates the effect on the inductive reactance when the frequency is increases to 2 f ?a. The inductive reactance increases by a factor of two.
b. The inductive reactance increases by a factor of four.
c. The inductive reactance is unchanged .
d. The inductive reactance decreases by a factor or four.
e. The inductive reactance decreases by a factor of two.
Physics Alternating Current Level: High School
When the frequency of an ac circuit is decreased , the current in the circuit increases . Which combination of elements is most likely to comprise the circuit ?a. Resistors only.
b. Inductors only.
c. Capacitors only.
d. Capacitors and resistors .
e. Inductors and capacitors.
Physics Alternating Current Level: High School
What is the capacitive reactance of a circuit comprised of a 65.0 micro F capacitor and a 50.0 Hz generator ?a. 49.0 ohm
b. 72.5 ohm
c. 97.6 ohm
d. 145 ohm
e. 308 ohm
Physics Alternating Current Level: High School
The current in a certain ac circuit is independent of the frequency at a given voltage . Which combination of elements is most likely to comprise the circuit ?a. Resistors only.
b. Inductors only.
c. Capacitors only.
d. A combination of inductors and resistors .
e. A combination of inductors and capacitors.
Physics Alternating Current Level: High School
Draw a vector diagram for the circuit shown in figure at “click here” . Show the condition of the power supply angular frequency W for each of the following cases to occur .(1) Current I leads to voltage E
(2) Current I lags voltage E.
(3) Current I is zero
Physics Alternating Current Level: High School
In the circuit shown in Figure at “click here” in each of the following cases , does the current I lead or lag the voltage E ?(1) VL > VC
(2) VL < VC
Physics Alternating Current Level: High School
A 6V peak sine wave is riding a DC voltage of 8V . If the DC voltage is lowered to 5V how far negative will the sine wave go ?
Physics Alternating Current Level: High School
A sine wave with an rms value of 10.6V is riding on a level of 24 V . What are the maximum and minimum values of the resulting waveform ?
Physics Alternating Current Level: High School
For a 0 degree reference sine wave with an rms value 6.37 determine the instantaneous value at pi/8 rad, pi/4 rad , pi/2rad , 3pi/4rad , pi/rad , 3pi/rad , 2pi rad .
Physics Alternating Current Level: High School
A certain wave has a positive going zero crossing at 0 degrees and an rms value of 20V , Calculate its instantaneous value of each: 15 degrees , 33 , 50 , 110 , 70, 145 , 250 , 325 degrees .
Physics Alternating Current Level: High School
One sine wave has a positive peak at 75 degrees and another positive peak at 100 degrees . How much each sine wave shifted in phase from the 0 degree reference ? What was the phase angle in them?
Physics Alternating Current Level: High School
A sine wave has a peak value of 12V . Determine the rms, peak to peak , and half cycle average ?
Physics Alternating Current Level: High School
Sine wave frequency of 50 kHz . How many cycles does it complete in 10 ms ?