The resistance of an ammeter is 27 Ω and its scale is graduated for currents upto 10 A. After an additional shunt is connected to this ammeter it becomes possible to measure currents upto 100 amperes by this meter. The value of shunt-resistance is :-

Question

The resistance of an ammeter is 27 Ω and its scale is graduated for currents upto 10 A. After an additional shunt is connected to this ammeter it becomes possible to measure currents upto 100 amperes by this meter. The value of shunt-resistance is :- (A) 2 k Ω (B) 20 Ω (C) 3 Ω (D) 0.3 Ω

Tardigrade Admin · Accepted Answer

90 R=10 × 27 ⇒ R=3 Ω <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/a6a789261911f1e75ccc6be82aec728c-.png" />

Q. The resistance of an ammeter is $27 Ω$ and its scale is graduated for currents upto $10 A$ . After an additional shunt is connected to this ammeter it becomes possible to measure currents upto $100$ amperes by this meter. The value of shunt-resistance is :-

$2 k Ω$

$20 Ω$

$3 Ω$

$0.3 Ω$

$90 R = 10 \times 27$
$\Rightarrow R = 3 Ω$

Q. The resistance of an ammeter is 27Ω and its scale is graduated for currents upto 10A. After an additional shunt is connected to this ammeter it becomes possible to measure currents upto 100 amperes by this meter. The value of shunt-resistance is :-

2kΩ

20Ω

3Ω

0.3Ω