
22-1
In this chapter, the concept of electric power is rst introduced, and then the most popular power mea-
surement
m
ethods
a
nd
i
nstruments
i
n
d
c,
a
c,
a
nd
p
ulse
w
aveform
c
ircuits
a
re
i
llustrated
.
Po
wer
is de
ned
as th
e
wo
rk performed per unit time
. So
,
di
mensionally,
it is ex
pressed
as jou
les
pe
r
se
cond,
J s
−1
. According to this general denition, electric power is the electric work or energy dissipated
pe
r
u
nit
t
ime,
a
nd
d
imensionally,
i
t
y
ields
Js JC Cs V A
1 1 1− − −
= × = ×
(22.1)
where
J
= J
oules
s
= s
econds
C
= C
oulombs
V
= v
olts
A
= a
mperes
e
p
roduct
v
oltage times current
g
ives
a
n
e
lectric
q
uantity
e
quivalent
to p
ower
.
22.1 Power Measurements ...