Question

In any circuit, power can be calculated as P=IV cos( theta) T or F?

Answer 1

false as not always

Answer 2

i think its true.. it holds good for all circuits
provided you say theta is the phase difference angle between voltage and current
for dc circuit.. theta is zero cause they are always in phase.. so it holds

and for any ac circuit the equation would hold.. so i think its true!

Answer 3

how about resistive circuits?P=V2/R

Answer 4

using Ohm's law.. you stil get P = VI for that :P

Answer 5

i get it

Answer 6

In any purely resistive circuit
\[P=\frac{V ^{2}}{R}=V \times I\]
When V and R are known, I can be calculated. The power factor, cos (theta), is unity. Therefore the equation P=IV cos( theta) is true.