An ammeter of resistance 5Ω has a full-scale deflection when a current of 50 mA flows in it. The value of the resistor required to adapt it to measure a current of 5 A is?
-
A.
0.25Ω -
B.
5.00Ω -
C.
19.80Ω -
D.
0.05Ω
Correct Answer: Option D
Explanation
R = (igrg)/I-ig = (50 x 10-3 x 5)/5-(50 x 10-3) = (0.25)/4.95 = 0.0505 = 0.05Ω