Compensation
theorem is useful in finding the changes in current or voltage when the value
of resistance is changed in the circuit.
COMPENSATION
THEOREM
This
theorem states that If the resistance of any branch of a network is changed
from R to (R + ΔR) where the current was originally I, then the change of
current at any point in the network may be calculated by assuming than an
e.m.f. – IΔR has been introduced into the modified branch while all other
sources have their e.m.f.s suppressed and are represented by their internal
resistance only.
[OR]
This
theorem states that any element in the linear, bilateral network, may be
replaced by a voltage source of magnitude equal to the current passing through
the element multiplied by the value of the element, provided the currents and
voltages in other parts of the circuit remain unaltered.
APPLICATIONS
This
theorem is useful to calculate the sensitivity of electrical networks and
bridges and it is also useful in potentiometer circuits, where a slight change
in one resistance results in a shift from a null condition.
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