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Grade: 11
        The household supply of electricity is at 220 V (rms value) and 50 Hz. Find the peak voltage and the least possible time in which the voltage can change crom the rms value to zero.
5 years ago

Answers : (2)

Navjyot Kalra
askIITians Faculty
654 Points
							Sol. E baserms = 220 V
Frequency = 50 Hz
(a) E base rms = E base 0/√2
⇒ E base 0 = E base rms  √2 =√2 * 220 = 1.414 * 220 = 311.08 V = 311 V
(b) Tiem taken for the current to reach the peak value = Time taken to reach the 0 value from r.m.s
I = I base 0/√2 ⇒ I base 0/√2 = I base 0 Sin ωt
⇒ ωt = π/4
⇒ t = π/4∗ = π/4 *2πf = π/8π50 = 1/400 = 2.5 ms

						
5 years ago
Arun Kumar
IIT Delhi
askIITians Faculty
256 Points
							
Hello
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty
5 years ago
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