Question

In an a.c. circuit with phase voltage V and current I, the power dissipated is

• A. V.I
• B. depends on phase angle between V and I
• C. $\frac{1}{2}\times V.I$
• D. $\frac{1}{\sqrt2}\times V.I$

Answer 1

Answer: (B)

depends on phase angle between V and I

Answer 2

The dissipation of power in an a.c. circuit is
$(P)=V\times I \times cos \, \theta$.Therefore current flowing in
the circuit depends upon the phase voltage (V)
and current (I) of the a.c. circuit.