Practice Conclusion (9.8) - Alternating Current - ICSE 11 Electricity and Electronics

Practise this section

9 questions

Flashcard drill
4 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 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.
Show hintHide hint
Think about how this is different from direct current.
Question 2.
What is RMS value?
Show hintHide hint
Consider how you measure electrical effectiveness.
3Question 3.
What defines Alternating Current?
- A current with constant direction
- A current that varies in magnitude only
- A current that reverses direction periodically
Show hintHide hint
Think about how AC behaves differently compared to DC.
4Question 4.
True or False: Power factor is always equal to 1 in AC circuits.
- True
- False
Show hintHide hint
Consider energy losses in AC systems.
Question 5.
You have a circuit with a power factor of 0.6. What implications does this have for the efficiency of the circuit? Calculate the real power given a voltage of 230V and RMS current of 10A.
Show hintHide hint
What does a lower power factor indicate about the efficiency?
Question 6.
An AC motor runs on a sinusoidal waveform with a peak voltage of 120V. What is the RMS voltage, and how does it affect power calculations?
Show hintHide hint
Remember the relationship between peak and RMS voltage.

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