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A shunt is a
Very high resistance
Medium resistance
Very low resistance
High resistance
Very low resistance
A shunt is a very low-value resistance connected in parallel with a measuring instrument (typically a PMMC galvanometer) to extend its current-measuring range. By diverting a significant portion of the total current away from the meter movement, it prevents the instrument coil from being damaged by excessive current.
A shunt is a very low-value resistance connected in parallel with a measuring instrument (typically a PMMC galvanometer) to extend its current-measuring range. By diverting a significant portion of the total current away from the meter movement, it prevents the instrument coil from being damaged by excessive current.
RshтАЛ=mтИТ1RmтАЛтАЛ тАФ where m=ImтАЛIтАЛ is the multiplying power of the shunt
IshтАЛ=IтИТImтАЛ тАФ Current division at the shunt junction
According to the principle of current division, when a low resistance RshтАЛ is placed in parallel with a meter resistance RmтАЛ, the majority of the current I flows through the path of least resistance. The shunt resistance is precisely calculated so that the meter only receives its full-scale deflection current ImтАЛ, while the remainder IshтАЛ=IтИТImтАЛ flows through the shunt.
Shunt resistance must always be in parallel with the moving coil instrument.
A lower RshтАЛ value results in a higher multiplying power (m) for the ammeter.
The shunt material is typically Manganin, chosen for its low temperature coefficient of resistance.
Allows measurement of very high currents using a standard low-range galvanometer.
Provides a protective bypass for the meter movement.
Increases heat dissipation if not sized correctly.
Accuracy depends on the thermal stability of the shunt material.
Range extension of DC ammeters.
Current sensing in motor control drives and battery management systems.
The resistance of the shunt is typically much smaller than the internal resistance of the meter (RshтАЛтЙкRmтАЛ).
Option A and D are incorrect because high resistance in parallel would not bypass enough current to protect the meter.
C is correct тАФ A shunt is a very low resistance connected in parallel to an ammeter to extend its current measuring range.
Remember that a 'shunt' always implies parallel connection, while a 'multiplier' (used for voltmeters) always implies series connection.
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