V ]. The current
differs (lags) in phase by
as compared
to voltage. Find (i) R, (ii) 
, and (iii) 
. Another device has twice the
values for R, 
and
. How are the answers affected?
Answer:
Here,
P = 2 kW = 2000 W
R =
? ; 
From
Now,
??(i)
From
From
(i), 
Now,
When
R, 
are all doubled, tan
does not change ; Z is doubled,
current is halved and power drawn is halved.
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