MEDIUM
12th ICSE
IMPORTANT
Earn 100

Show graphically the dependence of inductive reactance, capacitive reactance, current and impedance on frequency of alternating current.

Important Questions on Alternating Current

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 1
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.
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.