AVERAGE POWER
For sinusoidal (and other periodic signals)
we compute averages over one period
If voltage and current are in phase
If voltage and current are in quadrature
Purely
resistive
Purely
inductive or
capacitive
It does not matter
who leads
LEARNING EXAMPLE
Find the average
power absorbed
by impedance
Since inductor does not absorb power
one can use voltages and currents across
the resistive part
