HARD
12th ICSE
IMPORTANT
Earn 100

An alternating current is given by I=50 sin 100π t. Find the frequency of current, mean current during a positive half-cycle, virtual current and the current at t=1/300s.

Important Questions on Alternating Current

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 2
A hot-wire ammeter in an AC circuit reads 10 A (rms value). What is the peak current?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 3
If the peak alternating current in a circuit is 21.2 A, find out the reading of an ammeter connected in the circuit.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 4

The equation of an AC  voltage is

V=1002 sin 100 π t

Find the rms value and the frequency of the voltage.

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 5
The electric main in a house is marked 220 V-50 Hz. Write down the equation for the instantaneous voltage. The only variable in this equation should be t.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 6
The current and voltage in a circuit are given byI=3.5 sin(628t+30°) ampere, V=28 sin (628t-30°) volt. determine (i) peak value of current and voltage.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 6
The current and voltage in a circuit are given byI=3.5 sin(628t+30°) ampere, V=28 sin (628t-30°) volt. Determine  root-mean-square value.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 6
The current and voltage in a circuit are given by I=3.5 sin(628t+30°) ampere, V=28 sin (628t-30°) volt. Determine time -period of the current.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 6
The current and voltage in a circuit are given byI=3.5 sin(628t+30°) ampere, V=28 sin (628t-30°) volt. determine (iv) phase difference between voltage and current.