Alternating Current
The average value of an AC sine wave is ____ Times the peak value ?
.637
In an inductive AC circuit when the applied voltage is at its maximum negative value is ?
0
In a circuit that has a capacitance and resistance the current will lead the voltage by some angle between ____ and ____ degree ?
0 and 90
Three equal capacitors in series has _____ of the applied voltage ?
1/3V
The time for one cycle is 0.1 second, the frequency is ?
10
The current in an AC circuit with resistance only is ? The circuit has a resistance of 15 ohms and a voltage of 150 volts?
10 I = e/r
A circuit has a RMS voltage of 120vac, the peak voltage is?
170 Rms=.707 x peak
A circuit has a peak voltage of 275 volts, the average voltage is ?
175 Average = .637 x peak
The step down turns ratio of a transformer with 200 Turns in the primary and 100 turns in the secondary is ?
2:1
The hertz rating of an AC circuit is ? If the frequency is 20 cycles per 1/2 seconds ?
40 F= c/t
The true power in a 2 amp series RL circuit with a 100 ohm resistor is ?
400
What is the total capacitance of a 30 microfarad capacitor in parallel with a 15 microfarad capacitor ?
45
What is the secondary voltage of a transformers that has 200 turns in the primary with 150vac and a secondary of 100 turns ?
50
If the vector diagram of two AC waveforms is a right angle than the waves are _____ out of ?
90
The maximum voltage is generated by a rotating wire when the conductor is moving across a magnetic field at ______ deg ?
90
Power factor is the ratio of true power to _____ power ?
Apparent
The opposition to the current flow in a capacitive circuit is know as ?
Capacitive reactance
If the phase angles of two sine waves are both 00 then the waves are ?
Cosine of the phase angles
The self induced voltage across an inductance is equal to the change in ______ with the respect to time ?
Current
Capacitive reactance ______ when the frequency increase ?
Decrease
If the frequency remains the same the capacitive reactance will increase with an _____ in capacitance ?
Decrease
The phase relationship that exist between the voltage and the current in an inductive circuit can be remembered by ?
ELI THE ICE MAN
Capacitance is measured in ?
Faradas
According to the power triangle the apparent power is _____ greater than the true power ?
Greater
Inductance is measured in ?
Henry's
The total opposition to the current flow in AC circuit is ?
Impedance
Inductive reactance increases with an ____ in frequency ?
Increase
To increase the capacitance of a capacitor _____ the area of the plates ?
Increase
Opening the secondary of a CT under load will cause a dangerous level of ?
Induce high voltage
The ______ of a circuit always opposes any change in the current of the circuit ?
Inductance
The current in an inductive circuit ______ the voltage ?
Lags
The current in a capacitive circuit ____ the voltage ?
Leads
An electric current always a ?
Magnetic field
All DC rules and laws including ohm's law apply in AC circuits containing only ?
Pure resistance
The product of the source voltage across the branches is the _____ as the applied voltage ?
Same
Electrical energy is transferred from one circuit to another using electrical magnetic induction by a ?
Transformers
Transformers on which the primary and secondary voltage are 180 degrees out of phase are know as ______ wound transformers ?
Unlike
The formula for inductive reactance is ?
Xl = 2pieFL
