Ø
AC bridge circuits such
as wheatstone, Maxwell’s Inductance Bridge etc., are used for the precision
measurement of AC resistance, capacitance and inductance.
Ø
Active power is obtained by multiplying kVA by cos φ and its
unit is kW
Ø
As per Kirchhoff’s
current law, in any electrical network, the phasor sum of the currents
meeting at a junction is zero.
Ø
As per Kirchhoff’s
voltage law, the phasor sum of the voltage drops across each of the
conductors in any closed path (or mesh) in a network plus the phasor sum of the
e.m.fs. connected in that path is zero.
Ø
Maxwell’s L/C bridge is so called because for balance, it uses two opposite
impedances in opposite arms.
Ø
Maxwell-Wien bridge is
used for measuring inductance.
Ø Power Factor may be defined as the ratio of true power / apparent
power i.e (W/VA)
Ø
Reactive power is known as reactive kVA and is obtained by multiplying kVA
by sin φ. It is written by kVAR.
Ø The P.F of an R-C circuit is between zero and 1.
Ø
The unit of admittance
is Siemens.
Ø
The unit of capacitive
susceptance is Siemens.
1 comment:
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