AC Circuits Practice
10 problems · instant feedback · full explanations
AC voltage oscillates sinusoidally. RMS values are what meters read and what power calculations use — V_rms = V_peak/√2.
Q1.
What does AC stand for and mean?
Multiple choice · Easy
Q2.
European mains is 230 V RMS. What is the peak voltage?
Numerical answer (V) · Medium
Q3.
Mains AC has a period of 20 ms. What is its frequency?
Numerical answer (Hz) · Easy
Q4.
AC power calculations use:
Multiple choice · Medium
Q5.
A heater draws 10 A RMS from 120 V RMS mains. What is the average power?
Numerical answer (W) · Medium
Q6.
What is the capacitive reactance of a 100 µF capacitor at 50 Hz?
Multiple choice · Hard
Q7.
As frequency rises, inductive reactance:
Multiple choice · Hard
Q8.
Transformers only work with alternating current, not direct current.
True / False · Easy
Q9.
The average value of a sinusoidal AC voltage over one full cycle equals its RMS value.
True / False · Medium
Q10.
In a series RLC circuit at resonance:
Multiple choice · Medium