An ammeter of resistance 5Ω has a full-scale deflection...
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?
0.25Ω
5.00Ω
19.80Ω
0.05Ω
Correct answer is D
R = (igrg)/I-ig = (50 x 10-3 x 5)/5-(50 x 10-3) = (0.25)/4.95 = 0.0505 = 0.05Ω