Concept:A shunt is a low resistance connected in parallel with an ammeter to extend its current measuring range.
Explanation:The ammeter can safely carry only a limited current.
A shunt provides a parallel path for the excess current.
So, only a small, safe fraction of the total current passes through the ammeter.
This allows the combination to measure currents much larger than the ammeter’s normal full-scale value.
Thus, the shunt helps in measuring heavy current.
Answer:C. Measure heavy current.
