Voltage
Vrms
:. Watts
Vpk
Waveform
in
1Q load
IV
(0(1
1
1
1
OV
',:rn=
1
1
1
::y:~
1 1
1.414
-J2
IVA-····f··
1
1 1.732
..J3
ov
v
1
1 1.414
~V·-n--··r-
1
-J2
Fig 2.9 Table showing basic voltage waveforms
2.10 Audio Frequency
Power Comparison
Electronic Wattmeter
Chapter 2
Wrms
1
1
1.225
if
1.342
if
1.414
-J2
In
the audio range of frequencies, power measurement
comparisons between two systems having values P
1
and P
2
can be expressed logarithmically
in
terms of the decibel (dB).
being
one
tenth of a bel.
The expression then is:
p2
dB=
10 log -
10
p1
The standard reference unit for P
1
is 1 milliwatt of power
in
a
600-ohm resistive
load.
I 9
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