The resistance of an ammeter is $$13$$ Ω and its scale is graduated for a current up to $$100$$ A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents up to $$7$$ $$50$$ A by this meter. The value of shunt resistance is

Question

The resistance of an ammeter is $$13$$  Ω and its scale is graduated for a current up to $$100$$ A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents up to $$7$$ $$50$$ A by this meter. The value of shunt resistance is

Infinity Learn · Accepted Answer

Let ia be the current flowing through ammeter and i the total current. So, a current i−ia will flow through shunt resistance.Potential difference across ammeter and shunt resistance is the same.⇒    ia ×  $$R=$$  i−ia  ×Sor     $$S=iaRi$$−ia                              …..$$(i)Given$$,  ia $$=100$$  A,  $$i=750$$ A,  $$R=13$$  ΩHence,   $$S=100$$  ×  $$13750$$ −$$100$$ $$=$$ $$2$$  Ω

The resistance of an ammeter is $13 Ω$ and its scale is graduated for a current up to 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents up to 7 50 A by this meter. The value of shunt resistance is

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material

The resistance of an ammeter is 13 Ω and its scale is graduated for a current up to 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents up to 7 50 A by this meter. The value of shunt resistance is

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material

The resistance of an ammeter is $13 Ω$ and its scale is graduated for a current up to 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents up to 7 50 A by this meter. The value of shunt resistance is