Practice Alternating Current (ac) (3) - Electromagnetic Induction and Alternating

Practise this section

8 questions

Flashcard drill
4 cards from this section. Quick, good the night before a test.
Exercise
5 questions · about 3 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
Define Alternating Current (AC).
Show hintHide hint
Think about how the current changes over time.
Question 2.
What does RMS stand for?
Show hintHide hint
It measures the effective value of AC.
3Question 3.
What is the formula for RMS current?
- I_rms = I₀/√2
- I_rms = √2I₀
- I_rms = I₀
Show hintHide hint
Recall the relationship between RMS and peak values.
4Question 4.
True or False: In a purely capacitive circuit, current leads voltage by π/2.
- True
- False
Show hintHide hint
Think about the phase relationships in AC circuits.
Question 5.
A circuit has a peak current of 12A. Calculate the RMS current and average value over one full cycle.
Show hintHide hint
Use the appropriate formulas for RMS and average.
Question 6.
An LCR circuit has R = 10Ω, L = 0.1H, and C = 100μF. Calculate the impedance and phase angle.
Show hintHide hint
Remember to substitute values methodically.

4 more questions in this section. Enroll free to practise them all.