EASY
12th CBSE
IMPORTANT
Earn 100

A coil of henry inductance and ohm resistance is connected to volt, ac supply. Find the impedance of the circuit and time lag between max. alternating voltage and current.

Important Questions on Alternating Current
MEDIUM
12th CBSE
IMPORTANT

MEDIUM
12th CBSE
IMPORTANT

MEDIUM
12th CBSE
IMPORTANT

HARD
12th CBSE
IMPORTANT

MEDIUM
12th CBSE
IMPORTANT
(i) power is transmitted at . Comment on the feasibility of doing this.

MEDIUM
12th CBSE
IMPORTANT
power is to be delivered from a power station to a town away. One uses a pair of wires of radius for this purpose. Calculate the fraction of ohmic losses to the power transmitted if
(ii) a step-up transformer is used to boost the voltage to , power transmitted, then a step-down transformer is used to bring the voltage to .

MEDIUM
12th CBSE
IMPORTANT
Consider the circuit shown in Fig 7.6. Find the net current and the phase of . Show that .
Find the impedence for this circuit.

HARD
12th CBSE
IMPORTANT
For an circuit driven at frequency ω, the equation reads
Multiply the equation by i and simplify where possible.
