50 INPUT "ENTER MAXIMUM CURRENT READING IN AMPS" ; I
60 LET V=IC*RC/1000
70 LET IRS=I-(IC/1000)
80 LET RS=V/IRS
90 PRINT "SHUNT RESISTANCE VALUE = " RS "OHMS"
(c) Wattmeter
Wattmeters are used to measure the true power consumed in a.c.
and d.c. circuits. In a.c. circuits
True power = VI cos
<J>
where
V = the r.m.s. value of the applied voltage
/ = the load current.
<$>
= the phase angle between the voltage and the current.
A.c.
voltages are discussed in Chapter 6
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