Post-UTME Physics 2015 Objective — Question 4
Question 4 of 20 from the Post-UTME Screening (Post-UTME) Physics 2015 Objective paper, with the correct answer and a full explanation.
Advertisement
In an A.C circuit, the alternating current across a resistor is 5 sin 50 pi t. The root mean square value of the current is
- A. 5/sqrt(2) A
- B. sqrt(2)/5 A
- C. sqrt(2)/2 A
- D. 5sqrt(2)/2 ACorrect
Explanation
Irms = Ipeak/sqrt(2) = 5/sqrt(2) = 5sqrt(2)/2 A.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.