Y its not adequate to measure the resistance of the light lamp while its operating by the wheatnestone bridge?
Please explain..
The voltage across a lamp is not precisely controlled when measuring with a Wheatstone bridge and depends on the setting of the bridge. For voltage-dependent resistances, such as incandescent lights in operation, this means the measured resistance depends on the details of how the resistance is measured. This is a problem.
The accuracy of Wheatstone bridges also suffers if the resistance of the device under test is low enough for the resistances of the connections and wires to be significant sources of error. Measurements of any but the smallest light bulbs would run into this problem when operating the devices under test near their nominal operating voltages and currents.
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