# 8 - Alternating Current Questions Answers

Joshi sir comment
Joshi sir comment
Joshi sir comment
Joshi sir comment

is impedence as same as resistanace in a circuit // and // are capacitive reactance and inductive reactance constant values(i.e. independant of value of current in ac circuit at any time)  ??

Joshi sir comment

Write the question with correct symbols

yes it is equivalent to resistance for that circuit

chock coil is used to

1) increase current

2) increase voltage

3) decrease current

4) decrease voltage

here we know power= IV  & chock coil is used to reduce the power loss , so here what vyl be the answer

Joshi sir comment

chock coil in ac is the device equivalent to rheostat in dc, so it is used to increase current.

can you give me an idea of solving the parallel LC circuit? Also to find the phase difference between the I and E?

Joshi sir comment

1st make a 3 line circuit in which ac source, resistor with an inductor and resistor with a capacitor will be there in the three lines then divide total  current "I"

from AC into the two legs, equations will be

e = L di1/dt + i1R  (1)

e =q2 / C + i2 R     (2)                                        here dq2 / dt = i2

now solve