Level 2 Module 1 Alternating Currents 100%
VERIFIED
What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in
the secondary?
2:1
Opening the secondary circuit of a current transformer under load will cause a dangerous level of
induced high voltage
What is the frequency of an AC waveform that completes 20 cycles per half second?
40Hz
A circuit has a peak voltage of 275V. What is the average voltage value?
175V
Each of three equal capacitors in series has
one-third the applied voltage
The formula for inductive reactance is
XL = 2πfL
What is the current flow in a purely resistive AC circuit if the resistance is 15 ohms and the
voltage is 150V?
10A
If the area of the plates of a capacitor is increased, the amount of capacitance
increases
The self-induced voltage across an inductance is produced by a change in
current with respect to time
A 30-microfarad capacitor is in parallel with a 15-microfarad capacitor. The total capacitance is
45
One type of nonsinusoidal waveform is the
square wave
According to the power triangle, the apparent power is
greater than the true power
A device that uses electromagnetic induction to transfer electrical energy from one circuit to
another is a(n)
transformer
