A.c -4

In an electric iron heat producedm is same, whether it is connected across an A.c. source or across 50 V constant voltage. R.M.S. value of the A.C. voltage applied is

Factorise: a^(2) - b^(2) - 4ac + 4c^(2)

The expression y = ax^2+ bx + c has always the same sign as of a if (A) 4ac b^2 (C) 4ac= b2 (D) ac < b^2

When the tens digit of a three digit number abc is deleted, a two digit number ac is formed. How many numbers abc are there such that abc=9ac + 4c.

In an a.c. circuit, R=4Omega, Z= 5Omega, V_(rms)=200 V and I_(rms)=1.5 A. Calculate the average power consumed over a full cycle.

Distinguish between d.c. and a.c.

A : Wires of the transmission lines carrying A.C. are made of multiple stands. R : A.C. flows on surface of the conductor.

The capacitive reactance in an A.C. circuit is

State one advantage of a.c. over d.c.

Give two similarities between an A.C. generator and a D.C. motor.